Note 5 - Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2023

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	March 31, 2023
	Cost Basis		Unrealized Loss			Fair Value		Cash Equivalents		Short-term Securities		Long-term Securities
Level 1:
Money market funds	$	510	$	-		$	510	$	510	$	-	$	-
Level 2:
Certificates of deposit		302		-			302		-		-		302
Municipal securities		3,694		(28	)		3,666		-		3,367		299
Corporate bonds		2,197		(12	)		2,185		-		2,185		-
Subtotal		6,193		(40	)		6,153		-		5,552		601
Total	$	6,703	$	(40	)	$	6,663	$	510	$	5,552	$	601

	September 30, 2022
	Cost Basis		Unrealized Loss			Fair Value		Cash Equivalents		Short-term Securities		Long-term Securities
Level 1:
Money market funds	$	1,316	$	-		$	1,316	$	1,316	$	-	$	-
Level 2:
Certificates of deposit		800		-			800		-		498		302
Municipal securities		4,066		(65	)		4,001		-		3,772		229
Corporate bonds		2,402		(25	)		2,377		-		2,127		250
Subtotal		7,268		(90	)		7,178		-		6,397		781
Total	$	8,584	$	(90	)	$	8,494	$	1,316	$	6,397	$	781

Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]

Balance as of September 30, 2022	$	680
Accretion		24
Currency translation		10
Balance as of March 31, 2023	$	714