Note 8 - Leases - Lease Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Amortization of right-of-use assets	$ 146
Interest on lease liabilities	8
Operating lease cost	5,671
Short-term lease cost	738
Variable lease cost	145
Total lease cost	6,708
Operating cash flows from finance leases	8
Operating cash flows from operating leases	5,110
Financing cash flows from finance leases	246
Right-of-use assets obtained in exchange for new finance lease liabilities	0
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 2,467
Weighted-average remaining lease term – finance leases (in years) (Year)	2 years 14 days
Weighted-average remaining lease term – operating leases (in years) (Year)	10 years 343 days
Weighted-average discount rate – finance leases	1.50%
Weighted-average discount rate – operating leases	5.79%