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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Income Statement [Abstract]    
Revenues $ 12,951 $ 12,554
Cost of revenues 8,863 8,601
Gross margin 4,088 3,953
Selling and administrative expenses 3,228 2,453
Research and development expense 1,197 2,280
Operating loss (337) (780)
Other income (expense):    
Investment income 107 177
Interest expense (39) (24)
Other income (expense), net 16 56
Loss before provision for income taxes (253) (571)
Provision for income taxes 9 20
Net loss $ (262) $ (591)
Net loss per common share:    
Basic and diluted loss per share (in Dollars per share) $ (0.03) $ (0.07)
Weighted average shares outstanding:    
Basic and diluted (in Shares) 9,139,130 9,001,324
Condensed Consolidated Statements of Comprehensive Loss    
Net loss $ (262) $ (591)
Unrealized gain (loss) on marketable securities:    
Change in market value of marketable securities before reclassification, net of tax 173 135
Reclassification adjustment for realized gains included in net income, net of tax (2) (1)
Total unrealized gain on marketable securities, net of tax 171 134
Comprehensive loss $ (91) $ (457)