Annual report pursuant to Section 13 and 15(d)

Short-term Investments (Details)

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Short-term Investments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Short-term investments    
Certificates of deposits $ 3,682 $ 6,061
Held-to-maturity, pre-refunded municipal bonds 20,667 8,394
Total investments $ 24,349 $ 14,455