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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

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