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Note 5 - Long-term Debt - Outstanding Principal Amounts (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Outstanding principal amounts $ 884,648 $ 896,185
Line of Credit [Member] | Term A Loan [Member]    
Outstanding principal amounts 128,582 133,796
Line of Credit [Member] | Refinancing Term B Loan [Member]    
Outstanding principal amounts 756,066 762,389
Line of Credit [Member] | Swing Loan [Member]    
Outstanding principal amounts 0 0
Revolving Credit Facility [Member] | Line of Credit [Member]    
Outstanding principal amounts $ 0 $ 0