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
Sep. 30, 2014
Mar. 31, 2014
Schedule of Investments [Line Items]    
Certificates of deposit $ 5,368 $ 1,476
Held-to-maturity, pre-refunded municipal bonds 15,002 14,108
Total short-term investments $ 20,370 $ 15,584