Quarterly report pursuant to Section 13 or 15(d)

Loans Payable - Additional Information (Details)

v3.19.2
Loans Payable - Additional Information (Details)
6 Months Ended
Aug. 31, 2019
USD ($)
Aug. 01, 2019
USD ($)
Jul. 01, 2019
USD ($)
Jun. 28, 2019
USD ($)
May 01, 2019
USD ($)
Apr. 25, 2019
USD ($)
Mar. 29, 2019
USD ($)
Mar. 19, 2019
USD ($)
Feb. 07, 2019
USD ($)
a
Jan. 29, 2019
USD ($)
Jan. 11, 2019
USD ($)
Dec. 31, 2018
USD ($)
property
Dec. 21, 2017
Jun. 30, 2019
USD ($)
property
parcel
Sep. 30, 2019
USD ($)
Jul. 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
Jan. 15, 2019
USD ($)
Debt Instrument [Line Items]                                    
Loans payable, net                       $ 360,190,000   $ 346,558,000        
Debt instrument, interest rate. stated percentage                           5.00%        
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months                           $ 78,190,000        
Number of undeveloped parcels | parcel                           6        
Perimeter Square Loan and Perimeter Square Construction Loan                                    
Debt Instrument [Line Items]                                    
Loans payable, net                           $ 6,500,000        
First National Bank Line of Credit                                    
Debt Instrument [Line Items]                                    
Debt instrument, periodic payment                           24,656        
Line of Credit Facility, Maximum Borrowing Capacity                     $ 1,510,000              
Loans payable, net                       2,938,000   1,325,000        
Deutsche Bank                                    
Debt Instrument [Line Items]                                    
Debt instrument, periodic payment                           33,340        
Loans payable, net                       5,713,000   $ 5,678,000        
Debt instrument, interest rate. stated percentage                           5.71%        
Revere Loan                                    
Debt Instrument [Line Items]                                    
Debt instrument, periodic payment             $ 406,000   $ 30,000   $ 323,000     $ 300,000        
New Market                                    
Debt Instrument [Line Items]                                    
Debt instrument, periodic payment                           48,747        
Loans payable, net                       6,907,000   $ 6,811,000        
Debt instrument, interest rate. stated percentage                           5.65%        
Lumber River                                    
Debt Instrument [Line Items]                                    
Debt instrument, periodic payment                           $ 10,723        
Loans payable, net                       1,448,000   $ 1,427,000        
Lumber River | LIBOR                                    
Debt Instrument [Line Items]                                    
Debt instrument, basis spread on variable rate                           3.50%        
Benefit Street                                    
Debt Instrument [Line Items]                                    
Debt instrument, periodic payment                           $ 53,185        
Loans payable, net                       7,567,000   $ 7,466,000        
Debt instrument, interest rate. stated percentage                           5.71%        
Perimeter Square                                    
Debt Instrument [Line Items]                                    
Loans payable, net                       6,250,000   $ 6,250,000       $ 6,250,000
Debt instrument, interest rate. stated percentage                           6.50%       6.50%
Perimeter Square | Promissory Note [Member]                                    
Debt Instrument [Line Items]                                    
Loans payable, net                                 $ 6,500,000  
Perimeter Square Construction Loan                                    
Debt Instrument [Line Items]                                    
Loans payable, net                       247,000   $ 247,000       $ 247,000
Debt instrument, interest rate. stated percentage                           6.50%        
Village of Martinsville                                    
Debt Instrument [Line Items]                                    
Debt instrument, periodic payment       $ 89,664                   $ 89,664        
Loans payable, net       $ 16,500,000               0   $ 16,500,000        
Debt instrument, interest rate. stated percentage       4.28%                   4.28%        
Revere Loan                                    
Debt Instrument [Line Items]                                    
Debt instrument, periodic payment                   $ 20,000       $ 109,658        
Loans payable, net                       $ 1,059,000   $ 0        
Debt instrument, interest rate. stated percentage                           10.00%        
Line of Credit | First National Bank Line of Credit | LIBOR                                    
Debt Instrument [Line Items]                                    
Debt instrument, basis spread on variable rate                           3.00%        
Line of Credit | KeyBank                                    
Debt Instrument [Line Items]                                    
Line of credit facility, extension period                           1 year        
Debt instrument, periodic payment         $ 250,000 $ 1,000,000   $ 850,000                    
Long-term Line of Credit                           $ 34,290,000 $ 7,500,000 $ 27,000,000    
Line of Credit Facility, Maximum Borrowing Capacity $ 11,000,000                                  
Number of collateral properties | property                       9   9        
Line of Credit Facility, Commitment Fee Percentage                           4.90%        
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months                           $ 34,290,000        
Line of Credit | KeyBank | Amended and Restated Credit Agreement                                    
Debt Instrument [Line Items]                                    
Line of credit facility, extension period                         1 year 1 year        
Debt instrument, basis spread on variable rate                           2.50%        
Line of Credit | KeyBank | LIBOR                                    
Debt Instrument [Line Items]                                    
Debt instrument, basis spread on variable rate 35000.00%                                  
Line of Credit | KeyBank | Ladson Crossing, Lake Greenwood and South Park | Amended and Restated Credit Agreement                                    
Debt Instrument [Line Items]                                    
Repayments of overadvance                       $ 3,830,000            
Line of Credit | KeyBank | Village of Martinsville                                    
Debt Instrument [Line Items]                                    
Loans payable, net       $ 15,460,000                            
Harbor Point | Disposal Group, Disposed of by Sale, Not Discontinued Operations                                    
Debt Instrument [Line Items]                                    
Area of real estate property leased | a                 1.28                  
Subsequent Event | Line of Credit | KeyBank                                    
Debt Instrument [Line Items]                                    
Reduction in line of credit to refinance property   $ 7,550,000 $ 7,550,000