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Operating Risk (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Concentration Risk [Line Items] |  |  |  |  |
Provision for doubtful accounts, net | $ 274 | $ 73 |  | $ (19) |
Charge off provision for doubtful accounts |  |  |  | 21 |
Allowances for doubtful accounts | $ 881 | $ 607 |  | $ 534 | $ 574
Sales Revenue, Net [Member] | Customer A [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 13.60% |  | [1] | 15.70% |
Sales Revenue, Net [Member] | Customer B [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 12.70% | 16.50% |  | 15.80% |
Sales Revenue, Net [Member] | Customer C [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 10.40% | 13.70% |  | 11.70% |
Accounts Receivable [Member] | Customer B [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 23.70% | 26.10% |  |  |
[1] | Less than 10%

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