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Note 5 - Marketable Securities (Tables)

12 Months Ended

Sep. 30, 2025

Notes Tables

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

						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Losses*				*Gains*				*Fair Value*
September 30, 2025:
U.S. Treasury securities and obligations of U.S. government agencies		$	245,691			$	(94	)		$	168			$	245,765
Bank certificates of deposits			1,640				—				1				1,641
Corporate securities			4,199				—				—				4,199
Municipal securities			11,048				—				69				11,117
		$	262,578			$	(94	)		$	238			$	262,722
September 30, 2024:
U.S. Treasury securities and obligations of U.S. government agencies		$	118,159			$	(119	)		$	51			$	118,091
Bank certificates of deposits			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		$	61,116			$	61,137
Due after one year through five years			197,511				197,634
Due after five years through ten years			—				—
Due after ten years			3,951				3,951
Total marketable securities		$	262,578			$	262,722