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Note 11 - Stockholders’ Equity (Tables)
12 Months Ended
Dec. 31, 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 years ended December 31, 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 December 31, 2018

    858,334     $ 2.71       1.92  

Exercisable at December 31, 2018

    858,334     $ 2.71       1.92  
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

 

 

$

 

 

 

 

4.67

 

Exercisable at January 1, 2018

 

 

532,500

 

 

 

1.37

 

 

$

 

 

 

 

4.67

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Granted

 

 

335,000

 

 

 

1.25

 

 

 

 

 

 

 

5.00

 

Exercised

 

 

(40,000

)

 

 

1.26

 

 

 

 

 

 

 

 

 

Forfeited

 

 

-

 

 

 

-

 

 

 

   

 

 

-

 

Outstanding at December 31, 2018

 

 

1,367,500

 

 

$

1.34

 

 

$

-

 

 

$

3.96

 

Exercisable at December 31, 2018

 

 

1,125,000

 

 

$

1.37

 

 

$

-

 

 

$

3.75

 

(1)

The intrinsic value of the stock options at December 31, 2018 is the amount by which the market value of the Company’s common stock of $0.46 as of December 31, 2018 exceeds the exercise price of the option.