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Note 4 - Marketable Securities - Reconciliation of Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Amortized cost	$ 271,039	$ 200,951
Gross unrealized losses	(140)	(387)
Gross unrealized gains	86	52
Fair value	270,985	200,616
US Treasury and Government [Member]
Amortized cost	255,091	118,159
Gross unrealized losses	(140)	(119)
Gross unrealized gains	42	51
Fair value	254,993	118,091
Certificates of Deposit [Member]
Amortized cost	1,234	5,212
Gross unrealized losses	0	(13)
Gross unrealized gains	0	1
Fair value	1,234	5,200
Corporate Debt Securities [Member]
Amortized cost	3,782	77,580
Gross unrealized losses	0	(255)
Gross unrealized gains	0	0
Fair value	3,782	$ 77,325
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	10,932
Gross unrealized losses	0
Gross unrealized gains	44
Fair value	$ 10,976

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