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Debt and Line of Credit (Details Textual)
9 Months Ended 11 Months Ended 12 Months Ended
Oct. 30, 2018
USD ($)
financial_covenants
Jul. 01, 2014
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2019
USD ($)
period
Sep. 30, 2020
USD ($)
period
Dec. 31, 2018
USD ($)
Swap_Agreements
financial_covenants
Dec. 31, 2019
USD ($)
Jun. 30, 2019
Debt Instrument [Line Items]                
Repayment of remaining balance $ 17,225,000              
Mortgage loan                
Debt Instrument [Line Items]                
Debt instrument, face amount           $ 4,000,000    
Debt instrument, maturity term           10 years    
Debt instrument, principal amortization term           20 years    
Monthly repayments of long-term debt, principal and interest           $ 15,000    
Balloon payment           $ 2,551,000    
Number of financial covenants | financial_covenants           1    
Mortgage loan | Minimum                
Debt Instrument [Line Items]                
Debt instrument, restrictive covenant, fixed charge coverage ratio, amount           $ 25,000,000    
Senior Credit Facility | Line of Credit | 2018 Term Notes                
Debt Instrument [Line Items]                
Line of credit facility, current borrowing capacity $ 42,500,000              
Net cash proceeds from certain dispositions to the extent not reinvested 100.00%              
Net cash proceeds from stated equity issuances 50.00%              
Net cash proceeds from certain receipts above certain threshold amounts 100.00%              
Senior Credit Facility | Line of Credit | Line of Credit                
Debt Instrument [Line Items]                
Term of debt instrument   5 years            
Line of credit facility, current borrowing capacity   $ 80,000,000            
Line of credit facility, amount outstanding   30,000,000            
Consolidated fixed charge coverage ratio 1.25              
Senior Credit Facility | Line of Credit | Revolving loan agreement                
Debt Instrument [Line Items]                
Line of credit facility, current borrowing capacity $ 20,000,000 15,000,000            
Line of credit facility, amount outstanding 5,000,000              
Remaining balance available for borrowing $ 15,000,000              
Senior Credit Facility | Line of Credit | Term loan                
Debt Instrument [Line Items]                
Term of debt instrument 3 years              
Line of credit facility, current borrowing capacity $ 22,500,000 $ 65,000,000            
Security interest pledge 65.00% 65.00%            
Senior Credit Facility | Line of Credit | Eurodollar Rate | Minimum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 1.50%              
Senior Credit Facility | Line of Credit | Eurodollar Rate | Maximum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 2.375%              
Senior Credit Facility | Line of Credit | Base Rate | Minimum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 0.50%              
Senior Credit Facility | Line of Credit | Base Rate | Maximum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate 1.375%              
Mortgage Loan On Headquarters Facility | Mortgage loan | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate           2.00%    
Forecast                
Debt Instrument [Line Items]                
Consolidated leverage ratio               2.50
Forecast | Senior Credit Facility | Line of Credit | Revolving loan agreement                
Debt Instrument [Line Items]                
Line of credit facility, current borrowing capacity             $ 15,000,000  
Forecast | Senior Credit Facility | Line of Credit | Term loan                
Debt Instrument [Line Items]                
Principal repayment     $ 844,000 $ 563,000 $ 703,000      
Number of three-month periods, frequency of payment | period       4 4      
Debt Covenant Period, One | Senior Credit Facility | Line of Credit | Line of Credit                
Debt Instrument [Line Items]                
Consolidated leverage ratio 3.00              
Number of financial covenants | financial_covenants 2              
Debt Covenant Period, Two | Senior Credit Facility | Line of Credit | Line of Credit                
Debt Instrument [Line Items]                
Consolidated leverage ratio 2.75              
Debt Covenant Period, Three | Senior Credit Facility | Line of Credit | Line of Credit                
Debt Instrument [Line Items]                
Consolidated leverage ratio 2.50              
Debt Covenant Period, Four | Senior Credit Facility | Line of Credit | Line of Credit                
Debt Instrument [Line Items]                
Consolidated leverage ratio 2.00              
Interest Rate Swap | Mortgage loan                
Debt Instrument [Line Items]                
Number of interest rate swap agreements | Swap_Agreements           2    
First Half of Mortgage | Interest Rate Swap | Mortgage loan                
Debt Instrument [Line Items]                
Strike rate           5.91%    
Second Half of Mortgage | Interest Rate Swap | Mortgage loan                
Debt Instrument [Line Items]                
Strike rate           6.07%