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Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020
Loss Contingency Accrual, Provision | $ 1,150 |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | $ 499 | $ (619) | $ (1,026) |
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 |  | 1,104 |  |
Receivables [Member] |  |  |  |
Loss Contingency, Receivable, Ending Balance |  |  |  | $ 2,589
Failure of Equipment to Be Remedied Under Warranty Provision [Member] | Other Accrued Liabilities [Member] |  |  |  |
Loss Contingency Accrual, Ending Balance |  | $ 0 | $ 176 |

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