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Stockholders' Equity (Details) - Stock Option [Member] - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted Average Exercise Price, Outstanding, Beginning $ 4.58 $ 3.89
Weighted Average Exercise Price, Grants 7.38 5.92
Weighted Average Exercise Price, Terminations 6.63 5.68
Weighted Average Exercise Price, Exercises 1.89 3.47
Weighted Average Exercise Price, Outstanding, Ending 6.37 $ 4.58
Weighted Average Exercise Price, Vested 4.9  
Weighted average exercise price, Vested and expected to vest $ 6.37  
Aggregate Intrinsic Value, Outstanding, Beginning [1] $ 1,513,980 $ 516,990
Aggregate Intrinsic Value, Outstanding, Ending [1] 266,020 $ 1,513,980
Aggregate Intrinsic Value, Vested [1] 129,110  
Aggregate Intrinsic Value, Vested and expected to vest [1] $ 266,020  
2000 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, Beginning balance 117,500 126,500
Grants
Terminations (5,000)
Exercises (105,000) (4,000)
Outstanding, Ending balance 12,500 117,500
Vested 12,500  
Vested and expected to vest 12,500  
Reserved for future grants  
2010 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, Beginning balance 242,500 124,500
Grants 48,500 141,000
Terminations (19,000) (16,000)
Exercises (2,000) (7,000)
Outstanding, Ending balance 270,000 242,500
Vested 47,500  
Vested and expected to vest 270,000  
Reserved for future grants 1,000  
2017 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, Beginning balance
Grants 122,500
Terminations (11,000)
Exercises
Outstanding, Ending balance 111,500
Vested  
Vested and expected to vest 111,500  
Reserved for future grants 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.