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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 31, 2016
Accounting Policies [Abstract] |
Schedule of Estimated Useful Lives of Property, Plant and Equipment |
Leasehold land and buildings | 30 - 50 years
Plant and machinery | 5 - 15 years
Furniture, fixtures and equipment | 4 - 5 years
Motor vehicles | 3 - 5 years
Leasehold improvements | 2 - 5 years
Schedule of Allowance for Doubtful Account |
|  | Year ended March 31,
Allowance for doubtful account |  | 2014 |  | 2015 |  | 2016
Balance at beginning of the year |  | $ | 574 |  |  | $ | 534 |  |  | $ | 607 |
Provision for the year |  |  | 34 |  |  |  | 216 |  |  |  | 376 |
Bad debt recovery |  |  | (53 | ) |  |  | (143 | ) |  |  | (102 | )
Written off during the year |  |  | (21 | ) |  |  | — |  |  |  | — |
Exchange difference |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 534 |  |  | $ | 607 |  |  | $ | 881 |
Schedule of Assumptions Used In Valuing Stock Options |
|  | Year ended March 31,
|  | 2014 |  | 2015 |  | 2016
Risk-free interest rate – weighted average |  |  | N/A |  |  |  | 2.606 | % |  |  | N/A |
Expected life of options – weighted average |  |  | N/A |  |  |  | 10 years |  |  |  | N/A |
Stock volatility |  |  | N/A |  |  |  | 44.37 | % |  |  | N/A |
Expected dividend yield |  |  | N/A |  |  |  | 7.8 | % |  |  | N/A |
Schedule of Net Loss Per Share |
|  | Year ended March 31,
|  | 2014 |  | 2015 |  | 2016
Net loss attributable to Deswell Industries, Inc.: |  |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations |  | $ | (7,079 | ) |  | $ | (2,460 | ) |  | $ | (4,934 | )
Loss from discontinued operations |  |  | (411 | ) |  |  | (348 | ) |  |  | — |
Net loss attributable to Deswell Industries, Inc. |  | $ | (7,490 | ) |  | $ | (2,808 | ) |  | $ | (4,934 | )
Basic weighted average common shares outstanding |  |  | 16,186 |  |  |  | 16,056 |  |  |  | 16,056 |
Basic net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations per share |  | $ | (0.43 | ) |  | $ | (0.15 | ) |  | $ | (0.31 | )
Loss from discontinued operations per share |  |  | (0.03 | ) |  |  | (0.02 | ) |  |  | — |
Basic net loss per share |  | $ | (0.46 | ) |  | $ | (0.17 | ) |  | $ | (0.31 | )
|  | Year ended March 31,
|  | 2014 |  | 2015 |  | 2016
Basic weighted average common shares outstanding |  |  | 16,186 |  |  |  | 16,056 |  |  |  | 16,056 |
Effect of dilutive securities – Options |  |  | — |  |  |  | — |  |  |  | — |
Diluted weighted average common and potential common shares outstanding |  |  | 16,186 |  |  |  | 16,056 |  |  |  | 16,056 |
Diluted net loss per share |  |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations per share |  | $ | (0.43 | ) |  | $ | (0.15 | ) |  | $ | (0.31 | )
Loss from discontinued operations per share |  |  | (0.03 | ) |  |  | (0.02 | ) |  |  | — |
Diluted net loss per share |  | $ | (0.46 | ) |  | $ | (0.17 | ) |  | $ | (0.31 | )

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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