Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Letters of Credit Outstanding, Amount	$ 689
Standard Product Warranty Accrual, Period Increase (Decrease), Total	0	$ 0
Standard Product Warranty Accrual, Ending Balance	159	159
Performance Guarantees [Member]
Debt Instrument, Face Amount	0
Standby Letters of Credit [Member] | Cash Collateral Security Agreement [Member]
Letters of Credit Outstanding, Amount	689
Other Accrued Liabilities [Member]
Loss Contingency Accrual, Ending Balance	$ 0	$ 0