Investment in NEC TOKIN - Equity Method Investment Income (Loss) Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 181	$ 162	$ 404	$ 1,747
NEC TOKIN Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Net income (loss)	$ 2,012	$ 2,007	$ 4,362	$ 7,261
KEC’s economic interest %	34.00%	34.00%	34.00%	34.00%
Equity Method Investment, Equity Income (Loss) Before Adjustments	$ 684	$ 682	$ 1,483	$ 2,469
Amortization and depreciation	(581)	(488)	(1,125)	(624)
Equity Method investment, Inventory Profit Elimination	78	(32)	46	(98)
Income (Loss) from Equity Method Investments	$ 181	$ 162	$ 404	$ 1,747