Annual report pursuant to Section 13 and 15(d)

Schedule II Valuation and Qualifying Accounts (Details)

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Schedule II Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Allowance for Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance $ 10 $ 12 $ 147
Valuation Allowances and Reserves, Adjustments      (61)
Valuation Allowances and Reserves, Charged to Cost and Expense 30 (2) (79)
Valuation Allowances and Reserves, Additions (Deductions) 0 [1]    [1] 5 [1]
Valuation Allowances and Reserves, Ending Balance 40 10 12
Inventory Valuation Reserve [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance 2,032 1,479 1,551
Valuation Allowances and Reserves, Adjustments      (57)
Valuation Allowances and Reserves, Charged to Cost and Expense 2,881 1,090 816
Valuation Allowances and Reserves, Additions (Deductions) (647) [2] (537) [2] (831) [2]
Valuation Allowances and Reserves, Ending Balance 4,266 2,032 1,479
Valuation Allowance of Deferred Tax Assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance 36,285 2,253 527
Valuation Allowances and Reserves, Additions (Deductions) (7,631) [3] 34,032 [3] 1,726 [3]
Valuation Allowances and Reserves, Ending Balance 28,654 36,285 2,253
Allowance for Sales Returns [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance 19 13 7
Valuation Allowances and Reserves, Charged to Cost and Expense 189 218 98
Valuation Allowances and Reserves, Additions (Deductions) (166) (212) (92)
Valuation Allowances and Reserves, Ending Balance $ 42 $ 19 $ 13
[1] Accounts written off, net of recoveries.
[2] Inventory charged against inventory reserves.
[3] Change in valuation allowance due to change in assessment of realizability of deferred tax assets.