Note 8 - Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating lease cost	$ 124	$ 116
Short-term lease cost	0	0
Variable lease cost	29	29
Total	153	145
Operating cash flows from operating leases	$ 129	$ 138