Note 4 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Jun. 30, 2023

Notes Tables

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

	As of September 30, 2022
	Quoted Prices in		Significant
	Active Markets for		Other		Significant
	Identical Assets		Observable		Unobservable
	(Level 1)		(Level 2)		(Level 3)		Totals
Short-term investments:
Corporate bonds	$	—	$	894	$	—	$	894
Total assets	$	—	$	894	$	—	$	894
Contingent consideration liabilities:	$	—	$	—	$	175	$	175
Total liabilities	$	—	$	—	$	175	$	175

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Contingent consideration balance at October 1, 2022	$	175
Fair value adjustments		—
Payment of contingent consideration		(175	)
Contingent consideration at June 30, 2023	$	—
Contingent consideration balance at October 1, 2021	$	6,017
Fair value adjustments		(5,042	)
Payment of contingent consideration		(807	)
Contingent consideration balance at June 30, 2022	$	168