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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 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   —    (26,000)   (3,000)  $6.05      
Exercises   —    (15,000)   —   $4.80      
Outstanding at September 30, 2019   12,500    239,000    118,500   $6.50   $(344,100)
Vested at September 30, 2019   12,500    65,500    —   $5.74   $(13,300)
Vested and expected to vest at                         
September 30, 2019   12,500    239,000    118,500   $6.50   $(344,100)
Reserved for future grants   —    17,000    181,500           

 

(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 September 30, 2019   292,000   $3.58   $7.25 
Stock options granted during the nine-month period ended September 30, 2019   20,000   $3.31   $7.03 
Stock options that vested during the nine-month period ended September 30, 2019   34,000   $4.09   $6.87 
Stock options that were forfeited during the nine-month period ended September 30, 2019   29,000   $3.39   $6.05 
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions
   During the Three-Month Periods Ended September 30,   During the Nine-Month Periods Ended September 30, 
   2019   2018   2019   2018 
Risk-free interest rate   n/a    2.9%   2.20%   2.6%
Dividend yield   0%   0%   0%   0%
Expected volatility   n/a    55%   52%   57%
Expected life   n/a    6.5 years    5.3 years    5.4 years