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Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Cash And Cash Equivalents Held By Foreign Subsidiaries | $ 3,800 |
Temporary Difference Related To Undistributed Earnings, Deferred Tax Not Provided | 8,200 | $ 6,900
Domestic Tax Authority [Member] |  |
Deferred Tax Assets, Valuation Allowance | 38,917 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards | 78,200 |
Operating Loss Carryforwards, Subject to Expiration | 32,600 |
Operating Loss Carryforwards, Not Subject to Expiration | 45,600 |
Deferred Tax Assets, Valuation Allowance | 33,700 | 35,500
Foreign Tax Authority [Member] |  |
Deferred Tax Assets, Valuation Allowance |  | 41,376
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Operating Loss Carryforwards | 18,900 |
Deferred Tax Assets, Valuation Allowance | 4,800 | 5,200
Foreign Tax Authority [Member] | The Federal Taxation Service [Member] |  |
Operating Loss Carryforwards | 700 |
Deferred Tax Assets, Valuation Allowance | $ 400 | $ 700

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