Note 10 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating leases	$ 669	$ 600	$ 781
Asset amortization	489	355	252
Interest on lease liabilities	34	37	39
Variable lease cost	99	62	86
Short-term lease cost	59	42	42
Sublease income	(81)
Total net lease cost	$ 1,269	$ 1,096	$ 1,200