Investment in NEC TOKIN - Equity Method Investment Income (Loss) Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Document Period End Date			Dec. 31, 2016
Income (Loss) from Equity Method Investments	$ (133)	$ (6,505)	$ 271	$ (4,758)
NEC TOKIN Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Net income (loss)	$ 1,082	$ (17,867)	$ 5,444	$ (10,606)
KEC’s economic interest %	34.00%	34.00%	34.00%	34.00%
Equity Method Investment, Equity Income (Loss) Before Adjustments	$ 368	$ (6,075)	$ 1,851	$ (3,606)
Amortization and depreciation	(562)	(494)	(1,686)	(1,118)
Equity Method investment, Inventory Profit Elimination	61	64	106	(34)
Income (Loss) from Equity Method Investments	$ (133)	$ (6,505)	$ 271	$ (4,758)