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SEGMENT INFORMATION (Details) - Revenue from External Customers by Products and Services - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Revenue from External Customer [Line Items]
Revenue	$ 12,936	$ 13,990	$ 25,890	$ 26,940
Satellite Revenue [Member]
Revenue from External Customer [Line Items]
Revenue	6,603	7,576	13,343	14,228
Government Non-Space Revenue [Member]
Revenue from External Customer [Line Items]
Revenue	5,099	5,520	10,590	10,855
Other Commercial & Industrial Revenue [Member]
Revenue from External Customer [Line Items]
Revenue	$ 1,234	$ 894	$ 1,957	$ 1,857

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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