Note 9 - Commitments and Contingencies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash paid for amounts included in the measurement of operating lease liabilities	$ 1,802	$ 1,764
Cash paid for amounts included in the measurement of finance lease liabilities (i.e. interest)	1,235	0
Cash paid for amounts included in the measurement of finance lease liabilities (i.e. principal payment)	$ 1,109	$ (0)	$ (0)