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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Stockholders' 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, 2016  126,500   124,500   -  $3.89  $516,990 
Grants  -   141,000   -  $5.92     
Terminations  (5,000)  (16,000)  -  $5.68     
Exercises  (4,000)  (7,000)  -  $3.47     
Outstanding at December 31, 2017  117,500   242,500   -  $4.58  $1,513,980 
Grants  -   44,500   122,500  $7.39     
Terminations  -   (15,000)  (11,000) $6.55     
Exercises  (10,000)  (2,000)  -  $3.38     
Outstanding at September 30, 2018  107,500   270,000   111,500  $5.47  $1,400,530 
Vested at September 30, 2018  107,500   36,500   -  $2.59  $827,070 
Vested and expected to vest at September 30, 2018  107,500   270,000   111,500  $5.47  $1,400,530 
Reserved for future grants  -   1,000   188,500         
 
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions
 
  

During the Three-Month

Period Ended September 30, 2018

  

During the Nine-Month

Period Ended September 30, 2018

  

During the Year

Ended December 31, 2017

 
Risk-free interest rate  2.5%  2.6%  1.9%
Dividend yield  0%  0%  0%
Expected volatility  57%  57%  61%
Expected life          6.5 years            6.5 years   6.5 years