Quarterly report pursuant to Section 13 or 15(d)

Short-term Investments (Details)

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Short-term Investments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Schedule of Investments [Line Items]    
Certificates of deposit $ 8,413us-gaap_CertificatesOfDepositAtCarryingValue $ 1,476us-gaap_CertificatesOfDepositAtCarryingValue
Held-to-maturity, pre-refunded municipal bonds 16,809us-gaap_MunicipalDebtSecuritiesAtCarryingValue 14,108us-gaap_MunicipalDebtSecuritiesAtCarryingValue
Total short-term investments $ 25,222us-gaap_ShortTermInvestments $ 15,584us-gaap_ShortTermInvestments