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Note 5 - Short-Term Investments (Detail) - Short-term Investments in Debt Securities as Available-For-Sale at Fair Value (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Amortized Cost $ 5,825
Gross Unrealized Gains 2
Gross Unrealized Losses 5,826
Fair Value (1)
US Government Agencies Debt Securities [Member]
 
Amortized Cost 3,392
Gross Unrealized Gains 2
Gross Unrealized Losses 3,393
Fair Value (1)
Certificate Of Deposit [Member]
 
Amortized Cost 1,982 [1]
Gross Unrealized Gains    [1]
Gross Unrealized Losses 1,982 [1]
Fair Value    [1]
Corporate Debt Securities [Member]
 
Amortized Cost 451
Gross Unrealized Losses 451
Fair Value   
[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.