Note 9 - Debt Outstanding (Details Textual) - USD ($)		12 Months Ended
	Oct. 20, 2021	Sep. 30, 2025	Sep. 30, 2024
Amortization of Debt Issuance Costs		$ 330,000	$ 313,000
The 2026 Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Debt Instrument, Face Amount	$ 40,250,000
Proceeds from Issuance of Debt	$ 38,607,000
Debt Instrument, Interest Rate, Effective Percentage		5.70%	5.70%
Interest Expense, Debt		$ 2,000,000	$ 2,000,000
Amortization of Debt Issuance Costs		$ 300,000	$ 300,000
Debt Instrument, Maturity Date	Dec. 31, 2026