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