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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	Jan. 31, 2026	Apr. 30, 2025
Schedule Of Inventory Current Abstract
Raw materials and component parts	$ 14,764	$ 14,668
Work in progress	10,392	8,444
Finished goods	678	375
Inventories	$ 25,834	$ 23,487

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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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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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