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Note 7 - Long-term Debt - Outstanding Principal Amounts (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Outstanding principal amounts $ 896,185 $ 1,305,634
Line of Credit [Member] | Term A Loan [Member]    
Outstanding principal amounts 133,796 234,300
Line of Credit [Member] | Refinancing Term B Loan [Member]    
Outstanding principal amounts 762,389 795,034
Line of Credit [Member] | Swing Loan [Member]    
Outstanding principal amounts 0 41,300
Revolving Credit Facility [Member] | Line of Credit [Member]    
Outstanding principal amounts $ 0 $ 235,000