Note 3 - Short-term Investments (Tables)

9 Months Ended

Jun. 30, 2025

Notes Tables

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

	As of June 30, 2025
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Short-term investments:
Corporate bonds	$	1,998	$	—	$	(1	)	$	1,997

	As of September 30, 2024
	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Short-term investments:
Corporate bonds	$	21,814	$	35	$	—	$	21,849
U.S. treasury securities and securities of U.S. government-sponsored agency		8,356		22		—		8,378
Total	$	30,170	$	57	$	—	$	30,227