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Note 2 - Summary of significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
 
201
6
 
 
2015
 
                 
Weighted average grant date fair value
   $
0.28
     $
1.94
  
Weighted average assumptions used:
                
Expected dividend yield
    
0.00
%
    
0.00
%
Risk-free interest rate
    
1.64
%
    
1.51
%
Expected volatility
    
110.24
%
    
229.24
%
Expected life (in years)
    
5.00
      
5.00