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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]        
Net income $ 2,927,000us-gaap_NetIncomeLoss $ 1,148,000us-gaap_NetIncomeLoss $ 8,351,000us-gaap_NetIncomeLoss $ 104,292,000us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:        
Unrealized gain on short-term investments (net of tax of $10,000, $10,000, $15,000 and $20,000) 15,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 16,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 22,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 30,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Foreign currency translation loss (338,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (47,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (806,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (59,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Total other comprehensive loss, net of tax (323,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (31,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (784,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (29,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 2,604,000us-gaap_ComprehensiveIncomeNetOfTax $ 1,117,000us-gaap_ComprehensiveIncomeNetOfTax $ 7,567,000us-gaap_ComprehensiveIncomeNetOfTax $ 104,263,000us-gaap_ComprehensiveIncomeNetOfTax