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Note 7 - Stockholders' Equity (Deficit) (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Notes Tables    
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Expected dividend yield
 
0%
 
Risk free interest rate
  1.01%
-
2.43%
Expected life in years
 
5
 
Expected volatility 
  85%
-
213%
 
 
2015
 
2014
 
Expected dividend yield
 
 
 0%
 
 
 
 0
%
Risk free interest rate
 
 1.66%
-
2.43% 
 
 
 2.30
%
Expected life in years
 
 
10
 
 
 
10
 
Expected volatility
 
 
85%
 
 
 
85
%
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
 
 
 
 
Exercise
 
 
Weighted Average
 
 
 
Number
 
 
Price
 
 
Exercise Price
 
Stock Options
 
 
 
 
 
 
 
 
 
 
 
 
                         
Outstanding January 1, 2016
   
1,707,744
     
 
    $
0.84
 
Granted
   
1,301,084
    $
1.25
     
 
 
Expired
   
(416,599
)    
 
     
 
 
Outstanding September 30, 2016
   
2,592,229
     
 
    $
1.04
 
 
 
 
 
 
 
Exercise
 
 
Weighted
Average
 
 
 
Number
 
 
Price
 
 
Exercise Price
 
Stock Options
 
 
 
 
 
 
 
 
 
 
 
 
                         
Outstanding January 1, 2014
   
977,744
     
 
    $
0.60
 
Granted
   
240,000
    $
1.00
     
 
 
Outstanding December, 31, 2014
   
1,217,744
     
 
    $
0.68
 
Granted
   
490,000
    $
1.25
     
 
 
Outstanding December, 31, 2015
   
1,707,744
     
 
    $
0.84
 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
 
 
 
 
 
 
Exercise
 
 
Weighted Average
 
 
 
Number
 
 
Price
 
 
Exercise Price
 
Warrants
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding January 1, 2016
   
3,403,367
     
 
    $
1.05
 
Granted
   
423,291
    $
1.25
     
 
 
Outstanding September 30, 2016
   
3,826,658
     
 
    $
1.07
 
 
 
 
 
 
 
Exercise
 
 
Weighted
Average
 
 
 
Number
 
 
Price
 
 
Exercise Price
 
Warrants
 
 
 
 
 
 
 
 
 
 
 
 
                         
Outstanding January 1, 2014
   
3,153,367
     
 
    $
1.01
 
Granted
   
-
    $
-
     
 
 
Outstanding December, 31, 2014
   
3,153,367
     
 
    $
1.00
 
Granted
   
250,000
    $
1.25
     
 
 
Outstanding December, 31, 2015
   
3,403,367
     
 
    $
1.05