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Note 6 - Debt (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Apr. 17, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Feb. 19, 2021
Debt Issuance Costs, Net, Total   $ 3,263      
Unamortized Debt Issuance Expense   3,272 $ 1,220    
Interest Expense, Debt, Total   2,882 1,212 $ 991  
Credit Facility [Member]          
Debt Agreement, Maximum Borrowing Capacity         $ 350,000
Long-term Debt, Total   0      
Debt Issuance Costs, Net, Total   3,166      
Interest Payable, Current   $ 0 $ 135 $ 298  
Credit Facility [Member] | Minimum [Member]          
Line of Credit Facility, Commitment Fee Percentage   0.30%      
Credit Facility [Member] | Maximum [Member]          
Line of Credit Facility, Commitment Fee Percentage   0.50%      
Credit Facility [Member] | Base Rate [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.75%        
Credit Facility [Member] | Base Rate [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.25%        
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.75%        
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate 3.25%        
Credit Facility [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 35,000       50,000
Credit Facility [Member] | Draw Term Loan [Member]          
Long-term Debt, Total $ 130,000       $ 300,000
Draw Term Loan [Member]          
Amortization of Debt Issuance Costs   $ 485