Note 5 - Accumulated Other Comprehensive Loss - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Balance	$ 121,647	$ 142,457
Other comprehensive income	(2,511)	1,007
Balance	132,716	121,647
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(15)	(15)
Other comprehensive income	4	0
Balance	(11)	(15)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(15,298)	(16,305)
Other comprehensive income	(2,515)	1,007
Balance	(17,813)	(15,298)
AOCI Attributable to Parent [Member]
Balance	(15,313)	(16,320)
Other comprehensive income	(2,511)	1,007
Balance	$ (17,824)	$ (15,313)