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Condensed Consolidated Statements of Income and Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Revenues $ 9,337 $ 11,466 $ 21,360 $ 23,028
Cost of revenues 7,134 7,737 14,636 15,474
Gross margin 2,203 3,729 6,724 7,554
Selling and administrative expenses 2,335 2,816 5,046 5,648
Research and development expense 1,734 2,095 3,364 3,496
Operating loss (1,866) (1,182) (1,686) (1,590)
Other income (expense):        
Investment income 13 187 1,167 279
Interest expense (21) (26) (41) (67)
Other income, net 1 0 3 1
Loss before provision for income taxes (1,873) (1,021) (557) (1,377)
Benefit for income taxes (584) (164) (98) (204)
Net loss from continuing operations (1,289) (857) (459) (1,173)
Loss from discontinued operations, net of tax (192) (167) (408) (557)
Net loss $ (1,481) $ (1,024) $ (867) $ (1,730)
Net loss per common share:        
Basic loss from continued operations (in Dollars per share) $ (0.15) $ (0.10) $ (0.05) $ (0.14)
Basic loss from discontinued operations (in Dollars per share) (0.02) (0.02) (0.05) (0.06)
Basic loss per share (in Dollars per share) (0.17) (0.12) (0.10) (0.20)
Diluted loss from continued operations (in Dollars per share) (0.15) (0.10) (0.05) (0.14)
Diluted loss from discontinued operations (in Dollars per share) (0.02) (0.02) (0.05) (0.06)
Diluted loss per share (in Dollars per share) $ (0.17) $ (0.12) $ (0.10) $ (0.20)
Weighted average shares outstanding:        
Basic (in Shares) 8,834,945 8,780,633 8,830,486 8,771,494
Diluted (in Shares) 8,834,945 8,780,633 8,830,486 8,771,494
Condensed Consolidated Statements of Comprehensive Loss        
Net loss $ (1,481) $ (1,024) $ (867) $ (1,730)
Foreign currency translation adjustment 260 984 575 369
Change in market value of marketable securities before reclassification, net of tax of ($20) and ($61) 3 (194) 37 118
Reclassification adjustment for realized gains included in net income, net of tax of $356 in 2017 (2) 0 (691) 0
Total unrealized (loss) gain on marketable securities, net of tax 1 (194) (654) 118
Total other comprehensive loss (income) 261 790 (79) 487
Comprehensive loss $ (1,220) $ (234) $ (946) $ (1,243)