Note 10 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash paid for amounts included in the measurement of lease liabilities	$ 17,005
Cash paid for amounts included in the measurement of lease liabilities	8,331	$ 12,429	$ 12,449
Operating lease right-of-use assets obtained in exchange for lease obligations	$ 57,197
Weighted-average remaining lease term (in months) (Month)	70 months
Weighted-average discount rate	4.60%
Selling, General and Administrative Expenses [Member]
Operating lease cost	$ 13,633
Short-term lease cost	594
Depreciation and Amortization [Member]
Finance lease cost – amortization of right-of-use assets	14,312
Interest Expense [Member]
Finance lease cost – interest on lease liabilities	$ 3,372