Annual report pursuant to Section 13 and 15(d)

Inventories Inventories - Valuation Reserve Accounts (Details)

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Inventories Inventories - Valuation Reserve Accounts (Details) (Inventory Valuation Reserve [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Inventory Valuation Reserve [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves, Adjustments $ (129) $ 179 $ (594)
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance, beginning of period     1,705
Additions charged to expense     (17)
Charged to reserve $ (54) $ (197)