Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of the Provision for Income Taxes (Detail)

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Income Taxes - Reconciliation of the Provision for Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]      
Provision for income taxes at federal rate $ 5,149 $ 5,452 $ 5,670
State taxes (139) (173) (100)
Charges not deductible for income tax purposes 59 78 281
Recognition of tax benefit generated by qualified production activities deduction (403) (417) (77)
Research and development tax credits (80) (307) (134)
Valuation allowance 174 144 14
Uncertain tax positions (134) 90 428
Contingent earn-out   (326)  
Other (61) (112) 42
Total provision for income taxes $ 4,565 $ 4,429 $ 6,124