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Note 10 - Leases - Lease Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Cash paid for amounts included in the measurement of lease liabilities   $ 8,054  
Cash paid for amounts included in the measurement of lease liabilities   4,358 $ 6,398
Operating lease right-of-use assets obtained in exchange for lease obligations   $ 51,590  
Weighted-average remaining lease term (in months) (Month)   69 months  
Weighted-average discount rate 4.50% 4.50%  
Selling, General and Administrative Expenses [Member]      
Operating lease cost $ 3,300 $ 6,578  
Short-term lease cost 200 534  
Depreciation and Amortization [Member]      
Finance lease cost – amortization of right-of-use assets 3,541 6,862  
Interest Expense [Member]      
Finance lease cost – interest on lease liabilities $ 764 $ 1,476