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Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 4,038	$ 4,963
Work-in-progress	2,372	4,437
Finished goods	1,704	1,428
Total inventories	8,114	10,828
Obsolescence allowance at beginning of the year	3,887	3,554	$ 3,450
Additional charges/(usage), net	(252)	341	134
Written off		(8)	(30)
Obsolescence allowance at the end of the year	$ 3,635	$ 3,887	$ 3,554

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Amount of expense related to write-down of inventories.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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