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Note 6 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 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.
-
$1.25
 
Expected dividend yield  
 
0%
 
 
Risk free interest rate 
1.93% 
-
2.40%
 
Expected life in years 
4.60
-
9.84
 
Expected volatility 
210%
-
266%
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Number
 
 
Weighted
Average
Exercise
Price
 
 
Weighted
Average
Remaining
 
Life
 
Stock Options
 
 
 
 
 
 
 
 
 
 
 
 
                         
Outstanding January 1, 2017
   
2,484,445
    $
1.18
     
9.82
 
Granted
   
150,000
     
1.25
     
4.60
 
Expired
   
(21,146
)    
1.00
     
 
 
Outstanding March 31, 2017
   
2,613,299
    $
1.14
     
8.17
 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
 
 
 
 
 
 
Weighted
Average
 
 
Weighted
Average
 
 
 
Number
 
 
Exercise
Price
 
 
Remaining
Life
 
Warrants
 
 
 
 
 
 
 
 
 
 
 
 
                         
Outstanding January 1, 2017
   
3,826,658
    $
1.02
     
5.72
 
Expired
   
100,000
     
1.25
     
 
 
Outstanding
March 31, 2017
   
3,726,658
    $
1.05
     
5.51