Note 7 - Leases - Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating lease costs	$ 1,485	$ 1,369	$ 1,270
Short-term leases	3,088	2,529	3,483
Variable lease costs	494	412	392
Net lease cost	$ 5,067	$ 4,310	$ 5,145