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Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
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Summary of net deferred income tax liability follows |  |
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)
Deferred Tax Liabilities, Gross, Total | (6,721) | (9,169)
Less: Valuation allowance | (564) | (420)
Total | $ (7,285) | $ (9,589)

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