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Note 5 - Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Apr. 17, 2020
Mar. 31, 2021
May 15, 2019
Unamortized Debt Issuance Expense   $ 3,769  
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] | 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 $ 50,000   $ 35,000
Debt Issuance Costs, Net, Total   3,166  
Credit Facility [Member] | Draw Term Loan [Member]      
Long-term Debt, Total $ 300,000   $ 130,000
Debt Issuance Costs, Net, Total   2,713  
Draw Term Loan [Member]      
Amortization of Debt Issuance Costs   $ 485