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, 2013
Mar. 31, 2013
Schedule of Investments [Line Items]    
Certificates of deposit $ 1,476 $ 3,682
Held-to-maturity, pre-refunded municipal bonds 15,683 20,667
Total short-term investments $ 17,159 $ 24,349