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Note 5 - Marketable Securities - Reconciliation of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Amortized cost	$ 262,578	$ 200,951
Gross unrealized losses	(94)	(387)
Gross unrealized gains	238	52
Fair value	262,722	200,616
US Treasury and Government [Member]
Amortized cost	245,691	118,159
Gross unrealized losses	(94)	(119)
Gross unrealized gains	168	51
Fair value	245,765	118,091
Certificates of Deposit [Member]
Amortized cost	1,640	5,212
Gross unrealized losses	0	(13)
Gross unrealized gains	1	1
Fair value	1,641	5,200
Corporate Debt Securities [Member]
Amortized cost	4,199	77,580
Gross unrealized losses	0	(255)
Gross unrealized gains	0	0
Fair value	4,199	$ 77,325
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	11,048
Gross unrealized losses	0
Gross unrealized gains	69
Fair value	$ 11,117

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