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Note 5 - Long-term Debt - Outstanding Principal Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Outstanding principal amounts $ 989,313 $ 1,305,634
Line of Credit [Member] | Term A Loan [Member]    
Outstanding principal amounts 223,762 234,300
Line of Credit [Member] | Refinancing Term B Loan [Member]    
Outstanding principal amounts 765,551 795,034
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