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Note 2 - Summary of Significant Accounting Policies (Details Textual) € in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | May 31, 2018 USD ($)
Restricted Cash | $ 516 |  | $ 1,142 |  |  |
Number of Operating Segments | 3 |  | 3 |  |  |
Inventory Write-down | $ 135 | $ 123 |  |  |  |
Deferred Grant Proceeds | 286 |  |  |  |  |
City of Rochester and State of New York [Member] |  |  |  |  |  |
Contingent Liability, Repayment of State and Local Grant Funds Received |  | $ 87 |  |  |  | $ 550
Covenant, Future Amount Receivable | 193 |  |  |  |  |
Bank Guarantee on Customer Order Deposit [Member] |  |  |  |  |  |
Restricted Cash | $ 516 |  | $ 1,142 | € 476 | € 1,067 |

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