Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)		12 Months Ended
Apr. 30, 2022	Mar. 31, 2024	Mar. 31, 2023
Accounts Receivable, Allowance for Credit Loss		$ 100,000	$ 200,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		3,000,000	2,000,000
Proceeds from Income Tax Refunds		3,900,000	400,000
Transfer of Ownership of Life Insurance Policy			$ 31,000
Unrecognized Tax Benefits, Ending Balance		$ 0
Customer Concentration Risk [Member] \| Revenue, Product and Service Benchmark [Member] \| O'Neal Steel [Member]
Concentration Risk, Percentage		16.00%	15.00%
Plateplus Inc. [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	516,041		516,041
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 4,800,000		$ 4,800,000
Life Insurance Policies Transfer [Member]
Liability, Other Retirement Benefits		$ 100,000	$ 100,000

The amount of transfer of ownership of life insurance policy in noncash transaction.

No definition available.

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- Definition

Amount of allowance for credit loss on accounts receivable.

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Number of shares of equity interests issued or issuable to acquire entity.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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- Definition

Amount of liability for retirement benefits, classified as other.

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Amount of income tax refund received from tax jurisdiction.

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Amount of unrecognized tax benefits.

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