XML 40 R21.htm IDEA: XBRL DOCUMENT v3.19.1
Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
201
8
    
2017
  
                 
Weighted average grant date fair value
   $
0.49
     $
0.26
  
Weighted average assumptions used:
                
Expected dividend yield
    
0.00
%
    
0.00
%
Risk-free interest rate
    
0.83
%
    
1.77
%
Expected volatility
    
225.21
%
    
75.46
%
Expected life (in years)
    
4.91
      
5.00