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2. Discontinued Operations (Details) - Disposal Groups, Including Discontinued Operations - Gillam Frequency Electronics Inc [Member] - Discontinued Operations [Member]
$ in Thousands
12 Months Ended
Apr. 30, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Revenues $ 4,694
Cost of revenues 3,314
Gross profit 1,380
Selling and administrative expenses 1,902
Research and development expenses 436
Operating Loss (958)
Other income (expense), net (9)
Loss before provision for income taxes (967)
Provision for income taxes 0
Net (loss) income (967)
Net loss from sale of discontinued operations (359)
Total net (loss) income from discontinued operations $ (1,326)