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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 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  -   34,500   102,500  $7.38     
Terminations  -   (9,000)  (5,000) $6.27     
Exercises  (5,000)  (1,000)  -  $3.19     
Outstanding at March 31, 2018  112,500   267,000   97,500  $5.36  $783,750 
Vested at March 31, 2018  112,500   36,500   -  $2.59  $656,460 
Vested and expected to vest at March 31, 2018  112,500   267,000   97,500  $5.36  $783,750 
Reserved for future grants  -   5,000   202,500         
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions

  

For the Three-Month

Period Ended March 31, 2018

  

For the Year

Ended December 31, 2017

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