CONTRACT (LIABILITIES) ASSETS, NET (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
CONTRACT (LIABILITIES) ASSETS, NET (Details) [Line Items]
Revenues	$ 8,949,000	$ 12,936,000	$ 17,153,000	$ 25,890,000
Loss on Contracts	737,000	31,000	2,000,000	47,000
Contracts Accounted for under Percentage of Completion [Member]
CONTRACT (LIABILITIES) ASSETS, NET (Details) [Line Items]
Revenues	$ 8,700,000	$ 12,200,000	$ 16,600,000	$ 24,600,000