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Note 2 - Summary of Significant Accounting Policies (Details Textual) € in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€) | May 31, 2018 USD ($)
Restricted Cash, Total | $ 0 | $ 1,142 |  |
Accounts Receivable, Allowance for Credit Loss, Recovery | 198 | 470 |  |
Accounts Receivable, Credit Loss Expense (Reversal) | $ 0 | 286 |  |
Number of Reporting Units | 3 |  |  |
Inventory Write-down | $ 544 | 771 |  |
Depreciation, Total | 1,021 | 809 |  |
Deferred Grant Proceeds | 246 |  |  |
Foreign Currency Transaction Gain (Loss), before Tax, Total | 9 | (109) |  |
City of Rochester and State of New York [Member] |  |  |  |
Contingent Liability, Repayment of State and Local Grant Funds Received |  |  |  | $ 550
Covenant, Future Amount Receivable | $ 193 |  |  |
Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 1 year |  |  |
Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 10 years |  |  |
Bank Guarantee on Customer Order Deposit [Member] |  |  |  |
Restricted Cash, Total |  | $ 1,142 | € 1,160 |

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