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Note 10 - Stockholders’ Equity (Tables)
9 Months Ended
Sep. 30, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Following is a summary of the warrant activity for the nine months ended September 30, 2018:

   

Number of 

Warrants 

   

Average 

Exercise Price 

   

Weighted Average Remaining Contractual Term in Years

 
                         

Outstanding at January 1, 2018

    858,334     $ 2.71       2.92  

Exercisable at January 1, 2018

    858,334       2.71       2.92  

Granted

    -       -       -  

Exercised / surrendered

    -       -       -  

Expired

    -       -       -  

Outstanding at September 30, 2018

    858,334     $ 2.71       2.17  

Exercisable at September 30, 2018

    858,334     $ 2.71       2.17  
Share-based Compensation, Stock Options, 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, 2018

    1,072,500       1.37     $ 1,309,425       4.67  

Exercisable at January 1, 2018

    532,500       1.37     $ 649,725       4.67  
                                 

Granted

    35,000       1.85               5.00  

Exercised

    (40,000

)

    1.26               -  

Forfeited

    -       -               -  

Outstanding at September 30, 2018

    1,067,500     $ 1.39     $ 374,750     $ 3.96  

Exercisable at September 30, 2018

    1,050,000     $ 1.38     $ 376,675     $ 3.94  

(1)

The intrinsic value of the stock options at September 28, 2018 is the amount by which the market value of the Company’s common stock of $1.74 as of September 28, 2018 exceeds the exercise price of the option.