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Note 8 - Stockholders' Equity (Details) - Warrants Outstanding (USD $)
Dec. 31, 2013
Class of Warrant or Right [Line Items]  
Number of Shares Exercisable 3,968,864
Exercise Price (in Dollars per Share) $ 4.35 [1]
Issued to private placement investors in October 2009 [Member]
  
Class of Warrant or Right [Line Items]  
Number of Shares Exercisable 198,864
Exercise Price (in Dollars per Share) $ 17.60
Issued to private placement investors in July 2011 [Member]
  
Class of Warrant or Right [Line Items]  
Number of Shares Exercisable 3,750,000
Exercise Price (in Dollars per Share) $ 3.60
Other [Member]
  
Class of Warrant or Right [Line Items]  
Number of Shares Exercisable 20,000
Exercise Price (in Dollars per Share) $ 13.80
[1] Average exercise price