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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Revenues      
Product $ 44,539 $ 40,590 $ 35,201
Service 8,185 5,845 4,415
Total revenues 52,724 46,435 39,616
Cost of revenues      
Cost of products 16,062 15,489 12,505
Cost of services 4,974 2,084 3,600
Total cost of revenues 21,036 17,573 16,105
Gross profit 31,688 28,862 23,511
Operating expenses      
Selling 6,119 4,630 3,909
General and administrative 11,464 9,117 5,416
Research and development 2,320 2,011 1,359
Impairment of intangible asset     350
Total operating expenses 19,903 15,758 11,034
Operating income 11,785 13,104 12,477
Other income (expense), net 1,318 (126) (146)
Earnings before income taxes 13,103 12,978 12,331
Income taxes 4,103 4,528 4,412
Net income $ 9,000 $ 8,450 $ 7,919
Net income per share:      
Basic (in Dollars per share) $ 2.61 $ 2.52 $ 2.41
Diluted (in Dollars per share) $ 2.49 $ 2.35 $ 2.29
Weighted average common shares outstanding:      
Basic (in Shares) 3,445 3,357 3,285
Diluted (in Shares) 3,611 3,593 3,462