Note 6 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Operating lease assets	$ 8,983	$ 8,998
Total leased assets	11,035	11,328
Current operating lease liabilities	1,043	688
Current finance lease liabilities	601	660
Long-term operating lease liabilities	8,695	8,889
Long term finance lease liabilities	916	1,152
Total, present value of lease liabilities	11,255	11,389
Property and Equipment [Member]
Finance lease assets	$ 2,052	$ 2,330