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Note 5 - Short-Term Investments (Detail) - Short-term Investments Classified as Available-for-sale Stated At Fair Value (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Available For Sale Investments $ 5,826
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
 
Available For Sale Investments 3,393
US Government Agencies Debt Securities [Member]
 
Available For Sale Investments 3,393
Certificate Of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
 
Available For Sale Investments 1,982
Certificate Of Deposit [Member]
 
Available For Sale Investments 1,982 [1]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
 
Available For Sale Investments 451
Corporate Debt Securities [Member]
 
Available For Sale Investments 451
Fair Value, Inputs, Level 2 [Member]
 
Available For Sale Investments $ 5,826
[1] We evaluated certificates of deposits held as of March 31, 2013 and concluded that they meet the definition of securities as available for sale.