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Note 10 - Debt and Commitments (Details Textual)		1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 01, 2023	Mar. 31, 2024 USD ($)	Nov. 30, 2015 USD ($) a ft²	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2024 USD ($)	Oct. 31, 2020
Investment Margin Account				$ 25,000,000			$ 25,000,000				$ 27,500,000
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale		$ 40,579,000					0	$ 40,579,000
Repayments of Other Long-Term Debt							2,500,000	47,500,000
Payments to Acquire Property, Plant, and Equipment							(0)	11,000
Operating Lease, Expense				96,000		$ 71,000	253,000	212,000
The 401(k) Retirement Plan [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Cost				126,000		139,000	460,000	471,000
The 409(A) Non-qualified Deferred Compensation Plan [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability				1,398,000		$ 1,158,000	1,398,000	$ 1,158,000			$ 716,000
Building [Member] | UTAH
Area of Real Estate Property | ft²			30,700
Land [Member] | UTAH
Area of Land | a			3.6
Payments to Acquire Property, Plant, and Equipment			$ 1,240,000
Margin Account [Member]
Proceeds from Issuance of Debt									$ 45,500,000	$ 29,500,000
Investment Margin Account									$ 75,000,000
Debt Instrument, Face Amount		$ 27,500,000		$ 25,000,000			$ 25,000,000
Repayments of Other Long-Term Debt					$ 2,500,000
Debt Instrument, Basis Spread on Variable Rate										0.50%
Debt Instrument, Interest Rate, Effective Percentage				5.00%			5.00%
Real Estate Bank Loan Secured by Logan Office [Member]
Loans Payable to Bank			$ 2,260,000	$ 997,300			$ 997,300
Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate			4.66%									3.33%
Long-Term Debt, Term												10 years
Debt Instrument, Periodic Payment							$ 16,700

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