Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Details)

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Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Allowance for Doubtful Accounts [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances and Reserves, Balance $ 53 $ 53
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense 39 168
Valuation Allowances and Reserves, Deductions [1] (2) (168)
Valuation Allowances and Reserves, Balance 90 53
Inventory Valuation Reserve [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances and Reserves, Balance 9,576 9,047
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense 822 621
Valuation Allowances and Reserves, Deductions [2] (1,940) (92)
Valuation Allowances and Reserves, Balance 8,458 9,576
Valuation Allowance of Deferred Tax Assets [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances and Reserves, Balance 46,683 39,667
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense [3] 5,507 7,016
Valuation Allowances and Reserves, Deductions 0 0
Valuation Allowances and Reserves, Balance 52,190 46,683
Allowance for Sales Returns [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances and Reserves, Balance 155 355
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense 399 572
Valuation Allowances and Reserves, Deductions (472) (772)
Valuation Allowances and Reserves, Balance $ 82 $ 155
[1] Accounts written off, including early pay discounts, net of recoveries.
[2] Inventory loss charged against inventory reserves.
[3] Change in valuation allowance due to assessment of realizability of deferred tax assets and, in fiscal year 2016, the impact of the early adoption of ASU 2016-09.