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Summary of Significant Accounting Policies (Net Income (Loss) Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Accounting Policies [Abstract]      
Loss from continuing operations $ (4,934) $ (2,460) $ (7,079)
Loss from discontinued operations (348) (411)
Net loss attributable to Deswell Industries, Inc. $ (4,934) $ (2,808) $ (7,490)
Basic weighted average common shares outstanding 16,056,000 16,056,000 16,186,000
Basic weighted average common shares outstanding      
Loss from continuing operations per share $ (0.31) $ (0.15) $ (0.43)
Loss from discontinued operations per share (0.02) (0.03)
Basic net loss per share $ (0.31) $ (0.17) $ (0.46)
Effect of dilutive securities - Options
Diluted weighted average common and potential common shares outstanding 16,056,000 16,056,000 16,186,000
Diluted net loss per share      
Loss from continuing operations per share $ (0.31) $ (0.15) $ (0.43)
Loss from discontinued operations per share (0.02) (0.03)
Diluted net loss per share $ (0.31) $ (0.17) $ (0.46)
Potential common shares related to stock options excluded from the computation of diluted net income (loss) per share 532,000 532,000
Shares related to stock options excluded from diluted net loss per share because their inclusion would have been anti-dilutive 132,000