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Note 2 - Summary of Significant Accounting Policies (Details Textual) € in Thousands, $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€) | Mar. 31, 2022 USD ($) | May 31, 2018 USD ($)
Restricted Cash | $ 0 | $ 1,142 |  |  |
Accounts Receivable, Allowance for Credit Loss, Recovery | 79 |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 0 |  |  |  |
Deferred Grant Proceeds | 259 |  |  |  |
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 |  | $ 1,142 | € 1,067 |  |

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