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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 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   $7.50      
Terminations   —    (12,000)   —   $5.07      
Exercises   —    (15,000)   —   $4.80      
Outstanding at March 31, 2019   12,500    243,000    121,500   $6.51   $(59,850)
Vested at March 31, 2019   12,500    32,500    —   $4.93   $63,860 
Vested and expected to vest at                         
March 31, 2019   12,500    243,000    121,500   $6.51   $(59,850)
Reserved for future grants   —    13,000    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 March 31, 2019   332,000   $3.65   $6.72 
Stock options granted during the three-month period ended March 31, 2019   10,000   $3.16   $7.50 
Stock options that vested during the three-month period ended March 31, 2019   —   $—   $— 
Stock options that were forfeited during the three-month period ended March 31, 2019   12,000   $2.65   $5.07 
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions

   During the Three-Month
Periods Ended March 31,		 
   2019   2018 
Risk-free interest rate   2.59%   2.5%
Dividend yield   0%   0%
Expected volatility   51%   57%
Expected life   4 years    5.1 years