Note 4 - Leases - Lessee's Total Lease Cost (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease cost
Amortization of right-of-use assets	$ 787
Interest on lease liabilities	306
Operating lease cost	2,134
Variable lease cost	278
Total lease cost	3,505
Operating cash flows from finance leases
Operating cash flows from operating leases	1,012
Financing cash flows from finance leases	767
Right-of-use assets obtained in exchange for new finance lease liabilities	2,154
Right-of-use assets obtained in exchange for new operating lease liabilities
Weighted-average remaining lease term — finance leases (Year)	4 years
Weighted-average remaining lease term — operating leases (Year)	5 years 255 days