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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2020
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, 2020:


   

Number of 

Warrants 

   

Average 

Exercise Price 

   

Weighted Average Remaining Contractual Term in Years

 
                         

Outstanding at January 1, 2020

    171,667     $ 13.55       0.92  

Exercisable at January 1, 2020

    171,667     $ 13.55       0.92  

Granted

    -       -       -  

Exercised / surrendered

    -       -       -  

Expired

    -       -       -  

Outstanding at March 31, 2020

    171,667     $ 13.55       0.67  

Exercisable at March 31, 2020

    171,667     $ 13.55       0.67  
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, 2020

    340,500     $ 5.97     $ -       3.33  

Exercisable at January 1, 2020

    292,000       6.48     $ -       3.08  
                                 

Granted

    -       -       -       -  

Exercised

    -       -       -       -  

Forfeited

    -       -       -       -  

Outstanding at March 31, 2020

    340,500     $ 5.97     $ -       3.08  

Exercisable at March 31, 2020

    310,500     $ 6.27     $ -       2.94