Note 8 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash paid under operating leases, gross	$ 10,080
Accounting Standards Update 2016-02 [Member]
Operating lease cost, gross	6,875	6,758
Sublease income	(5,133)	(5,080)
Net Operating lease cost	1,742	1,678
Cash paid under operating leases, gross	$ 10,080	$ 9,913
Weighted average remaining lease term - months (Month)	2 years 150 days
Weighted average discount rate	6.90%