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8. Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2019
Stockholders' Equity  
Schedule of stock options activity

Stock Options

  Number of Shares      Weighted Average Exercise Price per Share      Weighted Average Remaining Contractual Term      Aggregate Intrinsic Value  
                         
Outstanding at January 1, 2019     37,500     $ 8.36       2.24     $ 349,950  
                                 
Granted     -     $ -       -     $ -  
Exercised     (3,000 )   $ 7.85       -     $ 6,270  
Forfeited     (2,500 )   $ 7.85       2.04     $ 13,588  
                                 
Outstanding at June 30, 2019     32,000     $ 8.45       1.76     $ 13,600  
                                 
Vested and Exercisable at June 30, 2019     32,000     $ 8.45       1.76     $ 13,600  
Schedule of restricted stock awards activity

Restricted Stock Awards

  Shares      Weighted Average Grant Date Fair Value per Share      Aggregate Fair Value  
                   
Balance at January 1, 2019     120,499     $ 17.66     $ 2,129,175  
                         
Granted     120,586     $ 15.51     $ 1,870,487  
Vested     (28,168 )   $ 18.23     $ (513,446 )
Forfeited     (5,962 )   $ 15.18     $ (90,510 )
                         
Balance at June 30, 2019     206,955     $ 16.39     $ 3,395,706