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Condensed Consolidated Statements of Income and Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Revenues $ 17,569 $ 15,055 $ 34,254 $ 30,994
Cost of revenues 10,837 8,943 21,541 18,738
Gross margin 6,732 6,112 12,713 12,256
Selling and administrative expenses 3,511 3,464 6,996 6,626
Research and development expense 1,203 873 2,618 2,071
Operating profit 2,018 1,775 3,099 3,559
Other income (expense):        
Investment income 152 135 319 260
Equity loss   (136)   (117)
Impairment of investment in and loans receivable from affiliate   (350)   (350)
Interest expense (47) (26) (103) (50)
Other (expense) income, net (12) 8 (6) 88
Income before provision for income taxes 2,111 1,406 3,309 3,390
Provision for income taxes 670 630 1,100 1,270
Net income 1,441 776 2,209 2,120
Net income per common share        
Basic $ 0.17 $ 0.09 $ 0.26 $ 0.26
Diluted $ 0.17 $ 0.09 $ 0.26 $ 0.25
Weighted average shares outstanding        
Basic 8,401,636 8,318,874 8,389,942 8,311,679
Diluted 8,603,021 8,540,902 8,573,536 8,540,065
Comprehensive Income        
Net income 1,441 776 2,209 2,120
Other comprehensive income (loss):        
Foreign currency translation adjustment 449 (635) (145) (304)
Change in market value of marketable securities 42 15 369 (168)
Deferred tax effect of change in marketable securities (15) (5) (134) 61
Total other comprehensive income (loss) 476 (625) 90 (411)
Comprehensive income $ 1,917 $ 151 $ 2,299 $ 1,709