Annual report pursuant to Section 13 and 15(d)

Short-term Investments (Details)

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Short-term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2015
Mar. 31, 2014
Short-term investments    
Certificates of deposit $ 7,912 $ 1,476
Held-to-maturity, pre-refunded municipal bonds 15,994 14,108
Total investments $ 23,906 $ 15,584