Note 9 - Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Assets [Member]
Operating lease right-of-use assets	$ 534	$ 130
Accrued Liabilities [Member]
Current operating lease liabilities	225	132
Other Noncurrent Liabilities [Member]
Noncurrent operating lease liabilities	327	0
Accrued Liabilities and Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Total	$ 552	$ 132