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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of activity under the stock option plans

   2000 Plan   2010 Plan   2017 Plan   Weighted Average Exercise Price  

Aggregate Intrinsic Value(1)

 
Outstanding at December 31, 2017   117,500    242,500    —   $4.58   $1,513,980 
Grants   —    48,500    122,500   $7.38      
Terminations   —    (19,000)   (11,000)  $6.63      
Exercises   (105,000)   (2,000)   —   $1.89      
Outstanding at December 31, 2018   12,500    270,000    111,500   $6.37   $266,020 
Grants   —    10,000    10,000   $7.03      
Terminations   —    (20,000)   —   $5.65      
Exercises   —    (15,000)   —   $4.80      
Outstanding at June 30, 2019   12,500    245,000    121,500   $6.51   $(3,920)
Vested at June 30, 2019   12,500    63,500    —   $5.67   $63,150 
Vested and expected to vest at                         
June 30, 2019   12,500    245,000    121,500   $6.51   $(3,920)
Reserved for future grants   —    11,000    178,500           

 

(1)Intrinsic value is the difference between the fair market value as of the date indicated and as of the date of the option grant.

Schedule of additional information about the stock option plans
   Number of Shares   Weighted Average
Fair Value at Grant Date		   Weighted Average Exercise Price 
Non-vested stock options as of January 1, 2019   334,000   $3.63   $6.64 
Non-vested stock options as of June 30, 2019   303,000   $3.60   $7.25 
Stock options granted during the six-month period ended June 30, 2019   20,000   $3.31   $7.03 
Stock options that vested during the six-month period ended June 30, 2019   31,000   $4.02   $6.74 
Stock options that were forfeited during the six-month period ended June 30, 2019   20,000   $3.13   $5.65 
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions
   During the Three-Month
Periods Ended June 30,		   During the Six-Month
Periods Ended June 30,		 
   2019   2018   2019   2018 
Risk-free interest rate   1.81%   2.81%   2.20%   2.51%
Dividend yield   0%   0%   0%   0%
Expected volatility   52%   55%   52%   57%
Expected life   6.5 years    6.5 years    5.3 years    5.2 years