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Pro Forma Results of Operations (Detail) (Elcom, USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 31, 2011
Oct. 31, 2011
Elcom
   
Business Acquisition [Line Items]    
Revenues $ 16,850 $ 35,837
Operating profit 1,262 3,074
Net income $ 672 $ 1,984
Earnings per share- basic $ 0.08 $ 0.24
Earnings per share- diluted $ 0.08 $ 0.23