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
Jun. 30, 2012
Mar. 31, 2012
Short-term investments    
Certificates of deposits $ 5,581 $ 6,061
Held-to-maturity, pre-refunded municipal bonds 10,010 8,394
Total investments $ 15,591 $ 14,455