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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other comprehensive income (loss), net of tax:        
Unrealized gain (loss) on short-term investments, tax $ 44,000 $ (36,000) $ 59,000 $ (40,000)