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Condensed Financial Information of Deswell Industries, Inc. (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 11,996 | $ 14,325 | $ 23,278 | $ 32,030
Prepaid expenses and other current assets | 1,658 | 2,120 |  |
Total current assets | 50,653 | 58,240 |  |
Property, plant and equipment-net | 32,352 | 36,598 |  |
Total assets | 87,571 | 96,439 |  |
Current liabilities: |  |  |  |
Accrued payroll and employee benefits | 4,035 | 4,228 |  |
Other accrued liabilities | 1,289 | 1,201 |  |
Dividend payable | 562 |  |  |
Total current liabilities | 10,763 | 12,376 |  |
Total shareholders' equity | 76,808 | 84,063 | 89,610 | 101,576
Total liabilities and shareholders' equity | 87,571 | 96,439 |  |
Parent Company [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 294 | 1,369 | $ 1,739 | $ 393
Prepaid expenses and other current assets | 76 | 76 |  |
Amounts due from subsidiaries | 33,462 | 35,633 |  |
Total current assets | 33,832 | 37,078 |  |
Investments in subsidiaries | 44,861 | 48,360 |  |
Property, plant and equipment-net | 17 | 56 |  |
Total assets | 78,710 | 85,494 |  |
Current liabilities: |  |  |  |
Accrued payroll and employee benefits | 1,226 | 1,315 |  |
Other accrued liabilities | 114 | 116 |  |
Dividend payable | 562 |  |  |
Total current liabilities | 1,902 | 1,431 |  |
Total shareholders' equity | 76,808 | 84,063 |  |
Total liabilities and shareholders' equity | $ 78,710 | $ 85,494 |  |

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