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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Reconciliation of the provision for income taxes      
Provision for income taxes at federal rate $ 5,452 $ 5,670 $ 2,979
State taxes (173) (100) (69)
Charges not deductible for income tax purposes 78 281 140
Recognition of tax benefit generated by qualified production activities deduction (417) (77) (222)
Research and development tax credits (307) (134) (160)
Valuation allowance 144 14 67
Uncertain tax positions 90 428 32
Contingent earn-out (326)    
Other (112) 42 119
Total provision for income taxes $ 4,429 $ 6,124 $ 2,886