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Note 11 - Stockholders' Equity (Tables) (Prefered Stock [Member])
 6 Months Ended
Jun. 30, 2014
Prefered Stock [Member]
  
Note 11 - Stockholders' Equity (Tables) [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Assumptions used in the valuation of the warrants issued in the February 2013 Preferred Stock Offering are as follows:

       
         

Risk-free interest rate

    0.78

%

Expected volatility

    102.23

%

Expected life (in years)

    5.0  

Expected forfeiture rate

    0.0

%

Expected dividend yield

    0.00

%