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Note 5 - Long-term Debt - Outstanding Principal Amounts (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Outstanding principal amounts $ 880,000 $ 867,897
Line of Credit [Member] | Term A Loan [Member]    
Outstanding principal amounts 880,000 0
Line of Credit [Member] | Prior Term A Loan [Member]    
Outstanding principal amounts 0 118,153
Line of Credit [Member] | Prior Refinancing Term B Loan [Member]    
Outstanding principal amounts 0 749,744
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