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Investment in NEC TOKIN Equity Loss (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]    
Equity loss from NEC TOKIN $ (1,675) $ (3,377)
Nectokin Corporation [Member]
   
Schedule of Equity Method Investments [Line Items]    
120929 (3,154) (8,729)
Equity Method Investment, Ownership Percentage 34.00% 34.00%
Equity Method Investment, Equity Loss Before Adjustments (1,072) (2,968)
Amortization and depreciation (603) (409)
Equity loss from NEC TOKIN $ (1,675) $ (3,377)