Note 4 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Jun. 30, 2024

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	As of June 30, 2024
	(Level 1)		(Level 2)		(Level 3)		Totals
Short-term investments:
Corporate bonds	$	—	$	21,634	$	—	$	21,634
U.S. treasury securities and securities of U.S. government-sponsored agency				8,555				8,555
Total assets	$	—	$	30,189	$	—	$	30,189

	As of September 30, 2023
	(Level 1)		(Level 2)		(Level 3)		Totals
Short-term investments:
Corporate bonds	$	—	$	11,295	$	—	$	11,295
U.S. treasury securities and securities of U.S. government-sponsored agency		—		3,626		—		3,626
Total assets	$	—	$	14,921	$	—	$	14,921