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v3.23.2

Note 2 - Summary of Significant Accounting Policies (Details Textual) € in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 EUR (€) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | May 31, 2018 USD ($)
Restricted Cash | $ 0 |  | $ 0 |  |  | $ 1,142 |  |
Accounts Receivable, Allowance for Credit Loss, Recovery |  |  | 79 |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  | 0 |  |  |  |  |
Inventory Write-down | 131 | $ 107 | 266 | $ 230 |  |  |  |
Deferred Grant Proceeds | 273 |  | 273 |  |  |  |  |
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 |  | 193 |  |  |  |  |
Bank Guarantee on Customer Order Deposit [Member] |  |  |  |  |  |  |  |
Restricted Cash | $ 1,142 |  | $ 1,142 |  | € 1,067 |  |  |

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