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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Revenues $ 17,007 $ 17,569 $ 33,834 $ 34,254
Cost of revenues 10,775 10,837 21,336 21,541
Gross margin 6,232 6,732 12,498 12,713
Selling and administrative expenses 3,485 3,511 7,045 6,996
Research and development expense 1,483 1,203 3,226 2,618
Operating profit 1,264 2,018 2,227 3,099
Other income (expense):        
Investment income 208 152 351 319
Interest expense (36) (47) (95) (103)
Other income (expense), net 725 (12) 734 (6)
Income before provision for income taxes 2,161 2,111 3,217 3,309
Provision for income taxes 770 670 1,150 1,100
Net income 1,391 1,441 2,067 2,209
Net income per common share        
Basic (in Dollars per share) $ 0.16 $ 0.17 $ 0.24 $ 0.26
Diluted (in Dollars per share) $ 0.16 $ 0.17 $ 0.24 $ 0.26
Weighted average shares outstanding        
Basic (in Shares) 8,519,718 8,401,636 8,504,810 8,389,942
Diluted (in Shares) 8,821,779 8,603,021 8,780,388 8,573,536
Condensed Consolidated Statements of Comprehensive Income        
Net income 1,391 1,441 2,067 2,209
Other comprehensive income :        
Foreign currency translation adjustment 976 449 818 (145)
Change in market value of marketable securities (266) 42 (730) 369
Deferred tax effect of change in marketable securities 91 (15) 280 (134)
Total other comprehensive income 801 476 368 90
Comprehensive income $ 2,192 $ 1,917 $ 2,435 $ 2,299