Note 10 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating leases	$ 503	$ 527	$ 669
Asset amortization	310	462	489
Interest on lease liabilities	6	19	34
Variable lease cost	101	95	99
Short-term lease cost	25	87	59
Sublease income	(125)	(123)	(81)
Total net lease cost	$ 820	$ 1,067	$ 1,269