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, 2012
Mar. 31, 2012
Short-term investments    
Certificates of deposits $ 4,904 $ 6,061
Held-to-maturity, pre-refunded municipal bonds 18,228 8,394
Total investments $ 23,132 $ 14,455