Loans Payable - Summary of Loans Payable (Details)

v3.10.0.1

Loans Payable - Summary of Loans Payable (Details) - USD ($)																12 Months Ended
	Dec. 15, 2018	Dec. 11, 2018	Nov. 21, 2018	Nov. 08, 2018	Oct. 22, 2018	Oct. 15, 2018	Sep. 27, 2018	Jun. 28, 2018	Jun. 19, 2018	Jun. 15, 2018	May 23, 2018	Mar. 11, 2018	Jan. 10, 2018	Dec. 12, 2017	Aug. 29, 2017	Dec. 31, 2018	Nov. 05, 2018	Oct. 05, 2018	Sep. 07, 2018	Jul. 15, 2018	May 14, 2018	May 03, 2018	Dec. 31, 2017	Jul. 18, 2017	Jun. 14, 2017	May 03, 2017	Mar. 22, 2017	Apr. 28, 2016	Apr. 08, 2016
Debt Instrument [Line Items]
Long-term debt maturities in 2019																$ 88,036,000
Loans payable, net																360,117,000							$ 307,375,000
Total Principal Balance																369,612,000							313,778,000
Unamortized debt issuance cost																(5,144,000)							(5,656,000)
Total Loans Payable, including Assets Held for Sale																364,468,000							308,122,000
Less loans payable on assets held for sale, net loan amortization costs																4,351,000							747,000
Harbor Point [Member]
Debt Instrument [Line Items]
Loans payable, net																460,000							$ 553,000
Revere Loan [Member]
Debt Instrument [Line Items]
Monthly payment, amount			$ 575,000		$ 299,000		$ 1,300,000	$ 150,000	$ 2,600,000							$ 109,658
Debt interest rate																10.00%	10.00%			10.00%	9.00%	8.00%	10.00%
Loans payable, net																$ 1,059,000				$ 3,500,000	$ 3,500,000	$ 6,810,000	$ 6,808,000
Line of Credit [Member]
Debt Instrument [Line Items]
Debt interest rate																													8.00%
Loans payable, net																$ 3,000,000
Line of Credit [Member] | KeyBank December Maturing July 2018
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Loans payable, net																$ 3,830,000							15,532,000
Line of Credit [Member] | KeyBank December Maturing July 2018 | LIBOR
Debt Instrument [Line Items]
Debt spread over variable basis percentage																2.50%
Line of Credit [Member] | KeyBank Maturing December 2019
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Loans payable, net																$ 48,272,000							52,500,000
Line of Credit [Member] | KeyBank Maturing December 2019 | LIBOR
Debt Instrument [Line Items]
Debt spread over variable basis percentage																2.50%
Senior Convertible Notes [Member]
Debt Instrument [Line Items]
Monthly payment, amount	$ 234,199
Debt interest rate	9.00%																											9.00%
Loans payable, net																												$ 3,000,000
Harbor Point [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 11,024
Debt interest rate																5.85%
Perimeter Square [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																5.50%									5.50%
Loans payable, net																$ 6,250,000							5,382,000		$ 4,500,000
Perimeter Square Construction Loan [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																6.00%		6.00%
Loans payable, net																$ 247,000							0
Monarch Bank Building [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 7,340
Debt interest rate																4.85%
Loans payable, net																$ 0							1,266,000
Senior Convertible Notes [Member] | Senior Convertible Notes [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 234,199
Debt interest rate																9.00%
Loans payable, net																$ 1,369,000							1,369,000
DF I-Moyock [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 10,665
Debt interest rate																5.00%
Loans payable, net																$ 73,000							194,000
Rivergate [Member]
Debt Instrument [Line Items]
Monthly payment, amount																144,823
Loans payable, net																$ 22,117,000							22,689,000
Rivergate [Member] | LIBOR
Debt Instrument [Line Items]
Debt spread over variable basis percentage																2.95%
LaGrange Marketplace [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 15,065
Loans payable, net																$ 0							2,317,000
LaGrange Marketplace [Member] | LIBOR
Debt Instrument [Line Items]
Debt spread over variable basis percentage																3.75%
Folly Road [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 32,827
Debt interest rate																4.00%											4.00%
Loans payable, net																$ 6,073,000							6,181,000				$ 8,570,000
Columbia Fire House Construction Loan [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 25,452
Debt interest rate																4.00%										4.00%
Loans payable, net																$ 4,189,000							3,421,000			$ 4,300,000
Shoppes At Tj Maxx [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 33,880
Debt interest rate																3.88%
Loans payable, net																$ 5,539,000							5,727,000
Monarch Bank Line Of Credit [Member]
Debt Instrument [Line Items]
Monthly payment, amount														$ 7,340
Debt interest rate														4.85%
Loans payable, net														$ 1,270,000
Monarch Bank Line Of Credit [Member] | LIBOR
Debt Instrument [Line Items]
Debt spread over variable basis percentage						3.00%				3.50%			3.00%
Monarch Bank Line Of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Loans payable, net																$ 2,938,000							3,000,000
Monarch Bank Line Of Credit [Member] | Line of Credit [Member] | LIBOR
Debt Instrument [Line Items]
Debt spread over variable basis percentage																3.00%
JANAF Bravo [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.65%
Loans payable, net																$ 6,500,000							0
Walnut Hill Plaza [Member]
Debt Instrument [Line Items]
Monthly payment, amount															$ 26,850	$ 26,850
Debt interest rate															5.50%	5.50%
Loans payable, net															$ 3,900,000	$ 3,868,000							3,903,000	$ 3,390,000
Riversedge North [Member]
Debt Instrument [Line Items]
Monthly payment, amount		$ 11,436														$ 11,436
Debt interest rate		5.77%														5.77%
Loans payable, net		$ 1,800,000														$ 1,800,000							863,000
Twin City Commons [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 17,827
Debt interest rate																4.86%
Loans payable, net																$ 3,048,000							3,111,000
Shoppes At Eagle Harbor [Member]
Debt Instrument [Line Items]
Monthly payment, amount												$ 26,528				$ 26,528
Debt interest rate												5.10%				5.10%
Loans payable, net												$ 3,320,000				$ 0							3,341,000
New Market [Member]
Debt Instrument [Line Items]
Monthly payment, amount											$ 48,747					$ 48,747
Debt interest rate											5.65%					5.65%
Loans payable, net											$ 7,000,000					$ 6,907,000							0
Benefit Street [Member]
Debt Instrument [Line Items]
Monthly payment, amount								53,185								$ 53,185
Debt interest rate																5.71%			5.71%
Loans payable, net																$ 7,567,000			$ 7,600,000				0
Deutsche Bank [Member]
Debt Instrument [Line Items]
Monthly payment, amount								$ 33,340								$ 33,340
Debt interest rate								5.71%								5.71%
Loans payable, net								$ 5,740,000								$ 5,713,000							0
JANAF Acquisition [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 333,159
Debt interest rate																4.49%
Loans payable, net																$ 52,253,000							0
Tampa Festival [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 50,797
Debt interest rate																5.56%
Loans payable, net																$ 8,227,000							8,368,000
Forrest Gallery Shopping Center [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 50,973
Debt interest rate																5.40%
Loans payable, net																$ 8,529,000							8,669,000
South Carolina Food Lions Note [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 68,320
Debt interest rate																5.25%
Loans payable, net																$ 11,867,000							12,050,000
Cypress Shopping Center [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 34,360
Debt interest rate																4.70%
Loans payable, net																$ 6,379,000							6,485,000
Port Crossing Shopping Center [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 34,788
Debt interest rate																4.84%
Loans payable, net																$ 6,150,000							6,263,000
Freeway Junction [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 41,798
Debt interest rate																4.60%
Loans payable, net																$ 7,863,000							7,994,000
Harrodsburg Marketplace [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 19,112
Debt interest rate																4.55%
Loans payable, net																$ 3,486,000							3,553,000
Graystone Crossing [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 20,386
Debt interest rate																4.55%
Loans payable, net																$ 3,863,000							3,928,000
Bryan Station [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 23,489
Debt interest rate																4.52%
Loans payable, net																$ 4,472,000							4,547,000
Crockett Square [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.47%
Loans payable, net																$ 6,338,000							6,338,000
Pierpont Centre [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.15%
Loans payable, net																$ 8,113,000							8,113,000
Alex City Marketplace [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																3.95%
Loans payable, net																$ 5,750,000							5,750,000
Butler Square [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																3.90%
Loans payable, net																$ 5,640,000							5,640,000
Brook Run Shopping Center [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.08%
Loans payable, net																$ 10,950,000							10,950,000
Beaver Village I and II [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.73%
Loans payable, net																$ 9,400,000							9,400,000
Sunshine Plaza [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.57%
Loans payable, net																$ 5,900,000							5,900,000
Barnett Portfolio [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.30%
Loans payable, net																$ 8,770,000							8,770,000
Ft. Howard Square [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.57%
Loans payable, net																$ 7,100,000							7,100,000
Conyers Crossing [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.67%
Loans payable, net																$ 5,960,000							5,960,000
Grove Park Shopping Center [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.52%
Loans payable, net																$ 3,800,000							3,800,000
Parkway Plaza Shopping Center [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.57%
Loans payable, net																$ 3,500,000							3,500,000
Winslow Plaza Shopping Center [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.82%
Loans payable, net																$ 4,620,000							4,620,000
JANAF BJ's [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 29,964
Debt interest rate																4.95%
Loans payable, net																$ 5,065,000							0
Chesapeake Square [Member]
Debt Instrument [Line Items]
Monthly payment, amount																$ 23,857
Debt interest rate																4.70%
Loans payable, net																$ 4,434,000							4,507,000
Sagaree/Tri-County Associates/Berkley [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.78%
Loans payable, net																$ 9,400,000							9,400,000
Riverbridge [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.48%
Loans payable, net																$ 4,000,000							4,000,000
Franklin [Member]
Debt Instrument [Line Items]
Monthly payment, interest only																Interest only
Debt interest rate																4.93%
Loans payable, net																$ 8,516,000							8,516,000
Lumber river [Member]
Debt Instrument [Line Items]
Monthly payment, amount				$ 10,723						$ 10,723						10,723
Debt interest rate				3.50%						3.50%
Loans payable, net				$ 1,460,000						$ 1,480,000						$ 1,448,000							$ 1,500,000
Lumber river [Member] | LIBOR
Debt Instrument [Line Items]
Debt spread over variable basis percentage																3.50%