Note 3 - Investments (Tables)

6 Months Ended

Mar. 31, 2022

Notes Tables

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

	March 31, 2022
(In thousands)	Cost		Unrealized Gains		Unrealized Losses		Fair Value
Short-Term
Certificates of deposit		743		-		4		739
Investment securities – short-term	$	743	$	-	$	4	$	739
Long-Term
U.S treasury securities	$	16,157	$	-	$	694	$	15,463
Certificates of deposit		13,219		19		253		12,985
Investment securities – long-term	$	29,376	$	19	$	947	$	28,448

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
March 31, 2022
U.S treasury securities	$	15,463	$	694	$	-	$	-
Certificates of deposit		8,272		158		3,373		99
Investment securities	$	23,735	$	852	$	3,373	$	99