Note 10 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Amortization of right-of-use assets	$ 47	$ 19	$ 94	$ 39
Interest on lease liabilities	66	68	133	136
Operating lease costs	2,232	1,955	4,200	3,910
Total lease cost	$ 2,345	$ 2,042	$ 4,427	$ 4,085