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Stockholders' Equity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Grants 141,000  
Weighted Average Exercise Price, Outstanding, beginning $ 3.89 $ 3.57
Weighted Average Exercise Price, Grants 5.92 6.98
Weighted Average Exercise Price, Terminations 5.68 6.16
Weighted Average Exercise Price, Exercises 3.47 5.59
Weighted Average Exercise Price, Outstanding, ending 4.58 $ 3.89
Weighted average exercise price, Vested 2.62  
Weighted average exercise price, Vested and expected to vest $ 4.58  
Aggregate Intrinsic Value, Outstanding, beginning [1] $ 517,000 $ 945,000
Aggregate Intrinsic Value, Outstanding, ending [1] 1,513,980 $ 517,000
Aggregate Intrinsic Value, Vested [1] 956,760  
Aggregate Intrinsic Value, Vested and expected to vest [1] $ 1,513,980  
2000 Plan [Member] | Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Outstanding, beginning balance 126,500 131,500
Grants
Terminations (5,000) (5,000)
Exercises (4,000)
Outstanding, ending balance 117,500 126,500
Vested 117,500  
Vested and expected to vest 117,500  
Reserved for future grants  
2010 Plan [Member] | Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Outstanding, beginning balance 124,500 106,500
Grants 141,000 46,000
Terminations (16,000) (12,000)
Exercises (7,000) (16,000)
Outstanding, ending balance 242,500 124,500
Vested 37,500  
Vested and expected to vest 242,500  
Reserved for future grants 30,500  
2017 Plan [Member] | Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Outstanding, beginning balance
Grants
Terminations
Exercises
Outstanding, ending balance
Vested  
Vested and expected to vest  
Reserved for future grants 300,000  
[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.