Schedule of Inventories (Details) - USD ($)	Jul. 31, 2024	Apr. 30, 2024
Inventory Disclosure [Abstract]
Raw materials	$ 9,698,000	$ 10,130,000
Work in process	796,000	753,000
Finished goods	1,118,000	1,042,000
Inventory, gross	11,612,000	11,925,000
Less: allowance for obsolete inventory	(371,000)	(367,000)
Inventories, net	$ 11,241,000	$ 11,558,000

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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