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Note 4 - Marketable Securities (Tables)

9 Months Ended

Jun. 30, 2025

Notes Tables

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

						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Losses*				*Gains*				*Fair Value*
June 30, 2025:
U.S. Treasury securities and obligations of U.S. government agencies		$	255,091			$	(140	)		$	42			$	254,993
Bank certificates of deposit			1,234				—				—				1,234
Corporate securities			3,782				—				—				3,782
Municipal securities			10,932				—				44				10,976
		$	271,039			$	(140	)		$	86			$	270,985
September 30, 2024:
U.S. Treasury securities and obligations of U.S. government agencies		$	118,159			$	(119	)		$	51			$	118,091
Bank certificates of deposit			5,212				(13	)			1				5,200
Corporate securities			77,580				(255	)			—				77,325
		$	200,951			$	(387	)		$	52			$	200,616

Investments Classified by Contractual Maturity Date [Table Text Block]

		*Amortized*
		*Cost*				*Fair Value*
Due in one year or less		$	48,834			$	48,817
Due after one year through five years			218,423				218,386
Due after ten years			3,782				3,782
Total marketable securities		$	271,039			$	270,985