Note 3 - Investments (Tables)

12 Months Ended

Sep. 30, 2022

Notes Tables

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

	September 30, 2022
(In thousands)	Cost		Unrealized Gains		Unrealized Losses		Fair Value
Short-Term
Certificates of deposit		5,945		-		143		5,802
Investment securities – short-term	$	5,945	$	-	$	143	$	5,802
Long-Term
U.S treasury securities	$	16,178	$	-	$	1,085	$	15,093
Certificates of deposit		8,016		-		362		7,654
Investment securities – long-term	$	24,194	$	-	$	1,447	$	22,747

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

	In Unrealized Loss Position For Less Than 12 Months				In Unrealized Loss Position For Greater Than 12 Months
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
U.S treasury securities	$	-	$	-	$	15,093	$	1,085
Certificates of deposit		6,345		176		7,111		329
Investment securities	$	6,345	$	176	$	22,204	$	1,414