Schedule of Inventories (Details) - USD ($)	Oct. 31, 2022	Apr. 30, 2022
Inventory Disclosure [Abstract]
Raw materials	$ 8,347,000	$ 6,772,000
Work in process	618,000	618,000
Finished Goods	1,017,000	838,000
Inventory gross	9,982,000	8,228,000
Less: allowance for obsolete inventory	(340,000)	(288,000)
Inventories, net	$ 9,642,000	$ 7,940,000

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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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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 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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