Note 3 - Short-term Investments (Tables)

9 Months Ended

Jun. 30, 2024

Notes Tables

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

	As of June 30, 2024
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Short-term investments:
Corporate bonds	$	21,655	$	—	$	(21	)	$	21,634
U.S. treasury securities and securities of U.S. government-sponsored agency		8,566		—		(11	)		8,555
Total	$	30,221	$	—	$	(32	)	$	30,189

	As of September 30, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Short-term investments:
Corporate bonds	$	11,310	$	—	$	(15	)	$	11,295
U.S. treasury securities and securities of U.S. government-sponsored agency		3,622		4		—			3,626
Total	$	14,932	$	4	$	(15	)	$	14,921