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Note 3 - Stockholders' Deficit, Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Options exercise price (in dollars per share) $ 65.75  
Number of Shares Outstanding (in shares) 165,643  
Warrant [Member]    
Number of Shares Outstanding (in shares) 323,099 20,029
Average Exercise Price Outstanding (in dollars per share) $ 128.40 $ 198.75
Number of Shares Issued (in shares) 1,487,881 303,269
Average Exercise Price Issued (in dollars per share) $ 0.71 $ 123.75
Number of Shares Expired (in shares)   (79)
Average Exercise Price Expired (in dollars per share) $ 283.50
Number of Shares Exercised (in shares) (939,879) (120)
Average Exercise Price Exercised (in dollars per share) $ 123.75
Number of Shares Outstanding (in shares) 871,101 323,099
Average Exercise Price Outstanding (in dollars per share) $ 52.22 $ 128.40
Number of Shares Cancelled (in shares)  
Employee Stock Option [Member]    
Number of Shares Outstanding (in shares) 31,350 17,945
Average Exercise Price Outstanding (in dollars per share) $ 133.23 $ 187.75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 157,982 14,171
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 3.14 $ 69
Number of Shares Expired (in shares)   (766)
Average Exercise Price Expired (in dollars per share)   $ 293.25
Number of Shares Exercised (in shares) (1,312)
Options exercise price (in dollars per share) $ 65.75
Number of Shares Outstanding (in shares) 165,643 31,350
Average Exercise Price Outstanding (in dollars per share) $ 11.22 $ 133.23
Number of Shares Cancelled (in shares) (22,377)  
Average Exercise Price Cancelled (in dollars per share) $ 122.13