Investment in NEC TOKIN NEC Tokin Equity Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 223	$ 1,585
NEC TOKIN Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Net income (loss)	$ 2,350	5,255
KEC's economic interest %	34.00%		34.00%
Equity Method Investment, Equity Income (Loss) Before Adjustments	$ 799	1,787
Amortization and depreciation	(544)	(136)
Equity Method investment, Inventory Profit Elimination	(32)	(66)
Income (Loss) from Equity Method Investments	$ 223	$ 1,585