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Note 10 - Stockholders’ Equity (Tables)
9 Months Ended
Sep. 30, 2019
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
The following is a summary of the warrant activity for the nine months ended September 30, 2019:

   

Number of 

Warrants 

   

Average 

Exercise Price 

   

Weighted Average Remaining Contractual Term in Years

 
                         

Outstanding at January 1, 2019

    858,334     $ 2.71       1.92  

Exercisable at January 1, 2019

    858,334       2.71       1.92  

Granted

    -       -       -  

Exercised / surrendered

    -       -       -  

Expired

    -       -       -  

Outstanding at September 30, 2019

    858,334     $ 2.71       1.17  

Exercisable at September 30, 2019

    858,334     $ 2.71       1.17  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Stock option activity under the Company’s stock-based compensation plans is shown below:

   

Number of
Shares

   

Average
Exercise
Price per Share

   

Aggregate Intrinsic
Value(1)

   

Weighted
Average
Remaining
Contractual
Term in Years

 
                                 

Outstanding at January 1, 2019

    1,367,500       1.34     $ -       3.96  

Exercisable at January 1, 2019

    1,125,000       1.37     $ -       3.75  
                                 

Granted

    35,000       0.77       -       4.88  

Exercised

    -       -       -       -  

Forfeited

    -       -       -       -  

Outstanding at September 30, 2019

    1,402,500     $ 1.33     $ -     $ 3.25  

Exercisable at September 30, 2019

    1,385,000     $ 1.34     $ -     $ 3.23  

(1)

The intrinsic value of the stock options at September 30, 2019 is the amount by which the market value of the Company’s common stock of $0.64 as of September 30, 2019 exceeds the exercise price of the option.