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Note 3 - Short-Term Investments (Detail) - Short-term Investments Classified as Available-for-sale Stated At Fair Value (USD $)
Dec. 31, 2012
Available For Sale Investments $ 8,434,944
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
 
Available For Sale Investments 3,923,084
US Government Agencies Debt Securities [Member]
 
Available For Sale Investments 3,923,084
Certificate Of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
 
Available For Sale Investments 4,057,445
Certificate Of Deposit [Member]
 
Available For Sale Investments 4,057,445 [1]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
 
Available For Sale Investments 454,415
Corporate Debt Securities [Member]
 
Available For Sale Investments 454,415
Fair Value, Inputs, Level 2 [Member]
 
Available For Sale Investments $ 8,434,944
[1] We evaluated certificates of deposits held as of December 31, 2012 and concluded that they meet the definition of securities as defined in ASC 320.