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Stockholders' Equity (Tables)
12 Months Ended
Dec. 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           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  
Vested at December 31, 2018     12,500       47,500           $ 4.90     $ 129,110  
Vested and expected to vest at                                        
December 31, 2018     12,500       270,000       111,500     $ 6.37     $ 266,020  
Reserved for future grants           1,000       188,500                  

 

(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, 2018     205,000     $ 3.49     $ 6.07  
Non-vested stock options as of December 31, 2018     334,000     $ 3.63     $ 6.64  
Stock options granted during the year ended December 31, 2018     171,000     $ 3.83     $ 7.38  
Stock options that vested during the year ended December 31, 2018     12,000     $ 3.55     $ 7.52  
Stock options that were forfeited during the year ended December 31, 2018     30,000     $ 3.78     $ 6.63  
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions
    For the Year Ended
December 31,
2018
    For the Year Ended
December 31,
2017
 
Risk-free interest rate     2.6 %     1.9 %
Dividend yield     0 %     0 %
Expected volatility     56 %     61 %
Expected life     5.4 years       6.5 years