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Note 6 - Accounting for Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
For Three
Months Ended
September 30, 2017
    
For Three
Months Ended
September 30, 2016
    
For Nine
Months Ended
September 30, 2017
    
For Nine
Months Ended

September 30, 2016
  
                                 
Weighted average grant date fair value
    
-
      
-
     $
0.26
     $
0.29
  
Weighted average assumptions used:
                                
Expected dividend yield
    
-
      
-
      
0.0
%
    
0.0
%
Risk-free interest rate
    
-
      
-
      
1.77
%
    
1.38
%
Expected volatility
    
-
      
-
      
75.0
%
    
96.0
%
Expected life (in years)
    
-
      
-
      
5.0
      
5.0