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Note 4 - Marketable Securities (Tables)

3 Months Ended

Dec. 31, 2024

Notes Tables

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

						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Losses*				*Gains*				*Fair Value*
December 31, 2024:
U.S. Treasury securities and obligations of U.S. government agencies		$	68,189			$	(83	)		$	9			$	68,115
Bank certificates of deposit			2,229				(6	)			—				2,223
Corporate securities			42,634				(116	)			—				42,518
Municipal securities			528				—				—				528
		$	113,580			$	(205	)		$	9			$	113,384
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		$	86,122			$	85,951
Due after one year through five years			23,880				23,855
Due after ten years			3,578				3,578
Total marketable securities		$	113,580			$	113,384