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Note 5 - Long-term Debt (Details Textual)
$ in Thousands
9 Months Ended
Apr. 16, 2020
USD ($)
Apr. 15, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Apr. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Long-term Debt, Gross     $ 146,925     $ 180,150
Debt Issuance Costs, Net, Total     $ 6,729     6,512
Leverage Ratio     2.46      
Debt Service Coverage Ratio     1.44      
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     $ 130,000      
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]            
Debt Instrument, Interest Rate, Effective Percentage Unhedged Amount     4.00%      
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   $ 30,000        
Debt Instrument, Covenant, Maximum Leverage Ratio for Dividends   2.0        
Debt Instrument, Increase (Decrease), Net, Total     $ (33,000)      
Long-term Debt, Gross     147,000      
Debt Instrument, Unused Borrowing Capacity, Amount     47,400      
Debt Instrument, Liquidity     52,700      
Debt Issuance Costs, Net, Total   $ 1,900 6,700   $ 7,900 $ 6,500
Debt Instrument, Unhedged Portion     $ 17,000      
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     $ 77,000      
Credit Agreement [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity     120,000      
Long-term Line of Credit, Total     70,000      
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