Note 4 - Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Jun. 30, 2025	Aug. 30, 2024
Financing Receivable, before Allowance for Credit Loss	$ 12,996	$ 25,143
Financing Receivable, Allowance for Credit Loss	900	$ 933
Emerging Markets [Member]
Impairment of Intangible Assets, Finite-Lived	$ 2,800
Promissory Note [Member] | Subsidiary, Oil and Gas Product Manufacturing Operations in the Russian Federation [Member] | Discontinued Operations, Disposed of by Sale [Member]
Financing Receivable, before Allowance for Credit Loss			$ 3,500
Financing Receivable, Allowance for Credit Loss			900
Promissory Note [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Subsidiary, Oil and Gas Product Manufacturing Operations in the Russian Federation [Member] | Discontinued Operations, Disposed of by Sale [Member]
Financing Receivable, before Allowance for Credit Loss			3,500
Financing Receivable, Allowance for Credit Loss			$ 900