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Debt and Line of Credit (Details Textual)
1 Months Ended 12 Months Ended
Jun. 27, 2019
USD ($)
Oct. 30, 2018
USD ($)
financial_covenants
Apr. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Swap_Agreements
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Repayment of remaining balance   $ 17,225,000      
Long-term debt       $ 0 $ 29,365,000
Repayments of long-term debt       2,597,000 182,000
Repayments of long-term lines of credit       15,000,000 $ 0
2018 term notes          
Debt Instrument [Line Items]          
Repayments of long-term debt $ 21,375,000        
Mortgage loan          
Debt Instrument [Line Items]          
Repayments of Debt     $ 2,551,000    
Senior Credit Facility | 2018 revolver | 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%      
Senior Credit Facility | 2018 revolver | 2018 revolver          
Debt Instrument [Line Items]          
Consolidated fixed charge coverage ratio   1.25      
Senior Credit Facility | 2018 revolver | Revolving loan agreement          
Debt Instrument [Line Items]          
Line of credit facility, current borrowing capacity 20,000,000 $ 20,000,000   15,000,000  
Line of credit facility, amount outstanding   5,000,000      
Long-term debt       $ 0  
Remaining balance available for borrowing   $ 20,000,000      
Repayments of long-term lines of credit $ 13,000,000        
Senior Credit Facility | 2018 revolver | Term loan          
Debt Instrument [Line Items]          
Term of debt instrument   3 years      
Line of credit facility, current borrowing capacity   $ 22,500,000      
Security interest pledge   65.00%      
Net cash proceeds from stated equity issuances   50.00%      
Net cash proceeds from certain receipts above certain threshold amounts   100.00%      
Debt Covenant Period, One | Senior Credit Facility | 2018 revolver | 2018 revolver          
Debt Instrument [Line Items]          
Number of financial covenants | financial_covenants   2      
Debt Covenant Period, Three | Senior Credit Facility | 2018 revolver | 2018 revolver          
Debt Instrument [Line Items]          
Consolidated leverage ratio   2.50      
Debt Covenant Period, Four | Senior Credit Facility | 2018 revolver | 2018 revolver          
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       5.90%  
Second Half of Mortgage | Interest Rate Swap | Mortgage loan          
Debt Instrument [Line Items]          
Strike rate       6.10%