Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies Commitments and Contingencies (Details)

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Commitments and Contingencies Commitments and Contingencies (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 01, 2020
Sep. 04, 2020
May 28, 2020
Mar. 10, 2020
Sep. 30, 2020
Sep. 30, 2020
May 31, 2020
Jan. 30, 2020
Sep. 01, 2011
Loss Contingencies [Line Items]                  
Loss contingency, amount of damages sought     $ 3,150,000            
Former gain contingency, recognized in current period             $ 196,000    
Grove Economic Development Authority Tax Increment Revenue Note | Harbor Pointe Associates, LLC | Notes Payable, Other Payables | Guarantor Subsidiaries | Grove Economic Development Authority                  
Loss Contingencies [Line Items]                  
Debt issued                 $ 2,420,000
Number of semi-annual payment installments                 50
Guarantor obligations, maximum exposure amount                 $ 2,210,000
Guarantor Obligations, Amount Funded         $ 0 $ 44,000      
Amounts accrued for guarantor obligations         $ 0 $ 0      
Minimum | Grove Economic Development Authority Tax Increment Revenue Note | Harbor Pointe Associates, LLC | Notes Payable, Other Payables | Guarantor Subsidiaries | Grove Economic Development Authority                  
Loss Contingencies [Line Items]                  
Debt instrument, interest rate. stated percentage                 2.29%
Maximum | Grove Economic Development Authority Tax Increment Revenue Note | Harbor Pointe Associates, LLC | Notes Payable, Other Payables | Guarantor Subsidiaries | Grove Economic Development Authority                  
Loss Contingencies [Line Items]                  
Debt instrument, interest rate. stated percentage                 14.00%
Settlement expense                  
Loss Contingencies [Line Items]                  
Loss contingency, amount of damages awarded   $ 520,000   $ 5,000          
Settlement expense | Subsequent Event                  
Loss Contingencies [Line Items]                  
Loss contingency, amount of damages awarded $ 500,000                
Northeast                  
Loss Contingencies [Line Items]                  
Percentage accounted by properties of its annualized base rent         4.00% 4.00%      
Mid Atlantic                  
Loss Contingencies [Line Items]                  
Percentage accounted by properties of its annualized base rent         34.00% 34.00%      
Southeast                  
Loss Contingencies [Line Items]                  
Percentage accounted by properties of its annualized base rent         62.00% 62.00%      
Land and land improvements | Construction loan | Affiliated entity                  
Loss Contingencies [Line Items]                  
Credit bid purchase approved by the bankruptcy court               $ 200,000