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Note 10 - Debt and Commitments (Details Textual)	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2022 USD ($) ft²	Nov. 30, 2015 USD ($) ft² a	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2023 USD ($)	Oct. 31, 2020
Investment Margin Account			$ 29,421,000		$ 29,421,000			$ 75,000,000
Payments to Acquire Property, Plant, and Equipment			18,000	$ 38,000	23,000	$ 74,000
Deferred Compensation Liability, Current and Noncurrent			509,000		509,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Area of Real Estate Property | ft²	17,564
Proceeds from Sale, Land, Held-for-Use	$ 381,000
UTAH | Building [Member]
Area of Real Estate Property | ft²		30,700
UTAH | Land [Member]
Area of Land | a		3.6
Payments to Acquire Property, Plant, and Equipment		$ 1,240,000
Margin Account [Member]
Proceeds from Issuance of Debt							$ 29,500,000
Investment Margin Account			$ 29,400,000		$ 29,400,000
Debt Instrument, Basis Spread on Variable Rate					0.50%
Debt Instrument, Interest Rate, Effective Percentage			6.00%		6.00%
Real Estate Bank Loan Secured by Logan Office [Member]
Loans Payable to Bank		$ 2,260,000	$ 1,200,000		$ 1,200,000
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

X

- Definition

Loan carried out from the Investment Margin Account with the marketable securities pledged as collateral.

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Area of land held.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

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