Note 8 - Leases - Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Right of Use Asset	$ 42,400	$ 42,400	$ 0
Operating lease liability	50,626	50,626	$ 0
Operating lease cost	1,891	5,676
Short-term lease cost	34	102
Variable lease cost	267	757
Total lease cost	2,192	6,535
Operating cash flows from operating leases	2,002	6,052
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,253	$ 1,295
Weighted-average remaining lease term-operating leases (Year)	7 years 8 months 12 days	7 years 8 months 12 days
Weighted average discount rate-operating leases	3.80%	3.80%