XML 36 R21.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
201
7
    
2016
  
                 
Weighted average grant date fair value
   $
0.26
     $
0.28
  
Weighted average assumptions used:
                
Expected dividend yield
    
0.00
%
    
0.00
%
Risk-free interest rate
    
1.77
%
    
1.64
%
Expected volatility
    
75.46
%
    
110.24
%
Expected life (in years)
    
5.00
      
5.00