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Note 5 - Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 17, 2020
Mar. 31, 2021
Jun. 30, 2021
Sep. 30, 2021
Feb. 19, 2021
Unamortized Debt Issuance Expense       $ 3,470  
Credit Facility [Member]          
Debt Agreement, Maximum Borrowing Capacity         $ 350,000
Long-term Debt, Total     $ 0    
Debt Issuance Costs, Net, Total     $ 3,166    
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
Debt Issuance Costs, Net, Total   $ 3,166      
Credit Facility [Member] | Draw Term Loan [Member]          
Long-term Debt, Total $ 130,000       $ 300,000
Debt Issuance Costs, Net, Total   2,713      
Draw Term Loan [Member]          
Amortization of Debt Issuance Costs   $ 485 $ 485