Note 13 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating lease cost	$ 4,191	$ 3,960
Amortization of right-of-use assets	143	0
Interest on lease obligations	2	0
Variable lease cost	989	1,039
Total lease cost	5,325	4,999
Operating cash flows from operating leases	4,426	5,020
Operating cash flows from finance leases	2	0
Financing cash flows from finance leases	154	(0)	$ (0)
Lease assets obtained in exchange for new operating lease liabilities	1,506	1,921
Lease assets obtained in exchange for new financing lease liabilities	$ 2,523	$ 0