Note 4 - Leases - Lessee's Total Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Lease cost
Amortization of right-of-use assets	$ 938	$ 2,424
Interest on lease liabilities	375	1,001
Operating lease cost	2,070	5,996
Variable lease cost	133	523
Total lease cost	3,516	9,944
Operating cash flows for finance leases	0	0
Operating cash flows for operating leases	5,483	6,727
Financing cash flows for finance leases	1,021	2,734	$ 1,706
Right-of-use assets obtained in exchange for new finance lease liabilities	901	5,186
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 4,652	$ 5,250
Weighted-average remaining lease term — finance leases (in years) (Year)	4 years	4 years
Weighted-average remaining lease term — operating leases (in years) (Year)	6 years	6 years