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NOTE B - DISCONTINUED OPERATIONS (Details) - Disposal Groups, Including Discontinued Operations - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2017
Jul. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Disposal Groups, Including Discontinued Operations [Abstract]          
Revenues $ 943 $ 1,955 $ 1,448   $ 2,294
Cost of Revenues 674 1,390 1,064   1,621
Gross Margin 269 565 384   673
Selling and administrative expenses 346 703 456   950
Research and development expenses 118 268 94   277
Operating Loss (195) (406) (166)   (554)
Other income (expense), net (2) (3) (2)   (3)
Loss before provision for income taxes (197) (409) (168)   (557)
Benefit for income taxes 5 1 0   0
Net Loss $ (192) $ (408) $ (167) $ (408) $ (557)