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Note 5 - Bank Debt (Details Textual)
$ in Thousands
9 Months Ended 12 Months Ended
Jan. 08, 2021
USD ($)
Apr. 16, 2020
USD ($)
Apr. 15, 2020
USD ($)
Apr. 30, 2022
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 30, 2020
USD ($)
Long-term Debt, Gross         $ 137,738 $ 180,150  
Debt Issuance Costs, Net, Total         $ 6,120 6,512  
Leverage Ratio         2.68    
Debt Service Coverage Ratio         1.22    
Proceeds from Notes Payable, Total         $ 10,000 0  
Interest Rate Swap [Member]              
Derivative, Fixed Interest Rate         2.92%    
Derivative, Variable Interest Rate         6.42%    
Derivative, Amount of Hedged Item         $ 121,000    
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]              
Debt Instrument, Interest Rate, Effective Percentage Unhedged Amount         3.50%    
London Interbank Offered Rate (LIBOR) Swap Rate [Member] | Interest Rate Swap [Member]              
Derivative, Basis Spread on Variable Rate         3.50%    
Credit Agreement [Member]              
Debt Instrument, Covenant, Maximum Annual Capital Expenditures, Remainder of Fiscal Year     $ 30,000        
Debt Instrument, Covenant, Maximum Annual Capital Expenditures, Next Fiscal Year and Thereafter     $ 25,000        
Debt Instrument, Covenant, Maximum Leverage Ratio for Dividends     2.0        
Debt Instrument, Increase (Decrease), Net, Total         $ (42,400)    
Long-term Debt, Gross         137,700    
Debt Instrument, Unused Borrowing Capacity, Amount         43,800    
Debt Instrument, Liquidity         51,800    
Letters of Credit Outstanding, Amount         5,700    
Debt Issuance Costs, Net, Total     $ 1,900   6,100 $ 6,500 $ 7,900
Debt Instrument, Unhedged Portion         $ 16,700    
Credit Agreement [Member] | Interest Rate Swap [Member]              
Derivative, Fixed Interest Rate         2.92%    
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Variable Rate Floor     0.50%        
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]              
Debt Instrument, Basis Spread on Variable Rate     2.75%        
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]              
Debt Instrument, Basis Spread on Variable Rate     4.00%        
Credit Agreement [Member] | Through December 31, 2021 [Member]              
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio     1.05        
Credit Agreement [Member] | After December 31, 2021 [Member]              
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio     1.25        
Credit Agreement [Member] | Term Loan [Member]              
Long-term Debt, Gross         $ 68,000    
Credit Agreement [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity         120,000    
Long-term Line of Credit, Total         69,700    
Credit Agreement [Member] | Revolving Credit Facility [Member] | Interest Rate Swap [Member]              
Derivative, Notional Amount         53,000    
Paycheck Protection Program CARES Act [Member]              
Proceeds from Notes Payable, Total   $ 10,000          
Notes Payable, Total         10,000    
Notes Payable, Amount of Forgiveness Applied For         $ 10,000    
Paycheck Protection Program CARES Act [Member] | Subsequent Event [Member]              
Notes Payable, Amount of Forgiveness Pending $ 10,000            
Forgiveness of Notes Payable, Period from Receipt of Forgiveness Application During Which Lender Will Determine Forgiveness Amount (Day) 90 days            
Paycheck Protection Program CARES Act [Member] | Forecast [Member]              
Debt Instrument, Monthly Payment if Debt Instrument is Not Forgiven       $ 1,100