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Income Taxes (Tables) | 12 Months Ended
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Mar. 31, 2013
Income Taxes [Abstract] |
Components of income before income taxes |
|  | Year ended March 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
United States |  | $ | 14,597 |  |  | $ | 16,708 |  |  | $ | 8,954 |
China |  |  | 980 |  |  |  | (31 | ) |  |  | (194 | )
|  | $ | 15,577 |  |  | $ | 16,677 |  |  | $ | 8,760 |
Provision for income taxes related to income before income taxes |
|  | Year ended March 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 6,721 |  |  | $ | 1,744 |  |  | $ | 3,677 |
State |  |  | 65 |  |  |  | (19 | ) |  |  | 119 |
Foreign |  |  | — |  |  |  | (14 | ) |  |  | 13 |
|  |  | 6,786 |  |  |  | 1,711 |  |  |  | 3,809 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (2,538 | ) |  |  | 4,521 |  |  |  | (805 | )
State |  |  | (223 | ) |  |  | (140 | ) |  |  | (137 | )
Foreign |  |  | 260 |  |  |  | 18 |  |  |  | (48 | )
Changes in valuation allowance |  |  | 144 |  |  |  | 14 |  |  |  | 67 |
|  |  | (2,357 | ) |  |  | 4,413 |  |  |  | (923 | )
Total provision for income taxes |  | $ | 4,429 |  |  | $ | 6,124 |  |  | $ | 2,886 |
Reconciliation of the provision for income taxes |
|  | Year ended March 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
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 |
Provision for income taxes |  | $ | 4,429 |  |  | $ | 6,124 |  |  | $ | 2,886 |
Summary of net deferred income tax liability follows |
|  | March 31, |
|  | 2013 |  |  | 2012 |
Depreciation |  | $ | (2,212 | ) |  | $ | (2,232 | )
Accrued compensation |  |  | 200 |  |  |  | 134 |
Prepaid pension asset |  |  | (831 | ) |  |  | (792 | )
Accrued pension liability |  |  | 90 |  |  |  | 90 |
Accrued postretirement benefits |  |  | 364 |  |  |  | 353 |
Compensated absences |  |  | 584 |  |  |  | 516 |
Inventories |  |  | (968 | ) |  |  | (3,073 | )
Warranty liability |  |  | 144 |  |  |  | 76 |
Accrued expenses |  |  | 219 |  |  |  | 486 |
Stock-based compensation |  |  | 459 |  |  |  | 351 |
Intangible assets |  |  | (5,353 | ) |  |  | (5,418 | )
Net operating loss carryforwards |  |  | 151 |  |  |  | 48 |
New York State investment tax credit |  |  | 564 |  |  |  | 372 |
Other |  |  | (132 | ) |  |  | (80 | )
|  |  | (6,721 | ) |  |  | (9,169 | )
Less: Valuation allowance |  |  | (564 | ) |  |  | (420 | )
Total |  | $ | (7,285 | ) |  | $ | (9,589 | )
Net deferred income tax liability |
|  | March 31, |
|  | 2013 |  |  | 2012 |
Current deferred income tax asset |  | $ | 69 |  |  | $ | 37 |
Long-term deferred income tax asset |  |  | 150 |  |  |  | 22 |
Current deferred income tax liability |  |  | (373 | ) |  |  | (2,244 | )
Long-term deferred income tax liability |  |  | (7,131 | ) |  |  | (7,404 | )
|  | $ | (7,285 | ) |  | $ | (9,589 | )
Summarizes the changes to the unrecognized tax benefit |
|  | Year Ended March 31, |
|  | 2013 |  |  | 2012 |
Balance at beginning of year |  | $ | 1,787 |  |  | $ | 1,365 |
Deductions based upon tax positions taken during prior periods |  |  | (893 | ) |  |  | (501 | )
Additions based upon tax positions taken during the current period |  |  | 40 |  |  |  | 923 |
Settlements |  |  | (800 | ) |  |  | — |
Balance at end of year |  | $ | 134 |  |  | $ | 1,787 |

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