Note 10 - Leases - Supplemental Cash Flow and Other Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating cash flows from operating leases	$ 680	$ 596	$ 789
Operating cash flows from finance leases	34	36	38
Financing cash flows from finance leases	493	332	229
ROU assets obtained in exchange for operating lease liabilities	560	276	16
ROU assets obtained in exchange for finance lease liabilities	$ 40	$ 817	$ 192