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Note 10 - Stockholders’ Equity (Tables)
3 Months Ended
Mar. 31, 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 three months ended March 31, 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 March 31, 2019

    858,334     $ 2.71       1.67  

Exercisable at March 31, 2019

    858,334     $ 2.71       1.67  
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

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

Forfeited

 

 

-

 

 

 

-

 

 

 

 

 

 

 

-

 

Outstanding at March 31, 2019

 

 

1,367,500

 

 

$

1.34

 

 

$

-

 

 

$

3.71

 

Exercisable at March 31, 2019

 

 

1,217,500

 

 

$

1.36

 

 

$

-

 

 

$

3.60

 

(1)

The intrinsic value of the stock options at March 29, 2019 is the amount by which the market value of the Company’s common stock of $0.88 as of March 29, 2019 exceeds the exercise price of the option.