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Note 10 - Commitments and Contingencies (Details) - Future Minimum Lease Payments (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Future Minimum Lease Payments [Abstract]          
2015         $ 39,776us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016       30,353us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
2017     23,122us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018   17,656us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears      
2019 15,190us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears        
Subsequent to 2019 50,020us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter        
$ 176,117us-gaap_OperatingLeasesFutureMinimumPaymentsDue