Note 3 - Short-term Investments (Tables)

3 Months Ended

Dec. 31, 2023

Notes Tables

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

	As of December 31, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Short-term investments:
Corporate bonds	$	11,375	$	2	$	—	$	11,377
U.S. treasury securities and securities of U.S. government-sponsored agency		3,672		2		—		3,674
Total	$	15,047	$	4	$	—	$	15,051

	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