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Note 6 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Exercise price
  $
.26
 -
$1.25
 
Expected dividend yield
   
 
0%
 
 
Risk free interest rate
   
1.01%
 -
2.43%
 
Expected life in years
   
 
5
 
 
Expected volatility
   
85%
 -
213%
 
Exercise price
  $
1.00
-
$1.25
 
Expected dividend yield
   
 
0%
 
 
Risk free interest rate
   
1.89%
-
2.31%
 
Expected life in years
   
4.60
-
9.59
 
Expected volatility
   
204%
-
258%
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
 
 
 
 
Weighted
Average
 
 
Weighted
Average
 
 
 
 
 
 
Exercise
 
 
Remaining
 
   
 Number
   
Price
   
Life
 
Stock Options
 
 
 
 
 
 
 
 
 
 
 
 
                         
Outstanding January 1, 2017
   
2,484,445
    $
1.18
     
9.82
 
Granted
   
150,000
     
1.25
     
4.11
 
Expired
   
(21,146
)    
1.00
     
 
 
Outstanding June 30, 2017
   
2,613,299
    $
1.18
     
7.92
 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
 
 
 
 
 
 
Weighted
Average
 
 
Weighted
Average
 
 
 
 
 
 
Exercise
 
 
Remaining
 
   
 Number
   
Price
   
Life
 
Warrants
 
 
 
 
 
 
 
 
 
 
 
 
                         
Outstanding January 1, 2017
   
3,826,658
    $
1.02
     
5.72
 
Expired
   
100,000
     
1.25
     
 
 
Outstanding
June 30, 2017
   
3,726,658
    $
1.05
     
5.26