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Income Taxes (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Abstract] |  |  |  |
Income tax expense related to Fenco subsidiaries in Mexico | $ 28,000 | $ 141,000 | $ 126,000 | $ 281,000
Effective Income Tax Rate, Continuing Operations, Total | 50.30% | (10.00%) | (53.60%) | (18.80%)
Income tax expenses, excluding the net losses of Fenco's Canadian operations (in hundredths) | 33.00% | 37.70% | 36.90% | 39.30%

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