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Stockholders' Equity (Details) - Stock Option [Member] - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted Average Exercise Price, Outstanding, Beginning $ 6.37  
Weighted Average Exercise Price, Grants 7.50 $ 7.38
Weighted Average Exercise Price, Terminations 5.07 6.63
Weighted Average Exercise Price, Exercises 4.80 1.89
Weighted Average Exercise Price, Outstanding, Ending 6.51 $ 6.37
Weighted Average Exercise Price, Vested 4.93  
Weighted average exercise price, Vested and expected to vest $ 6.51  
Aggregate Intrinsic Value, Outstanding, Beginning [1] $ 266,020 $ 1,513,980
Aggregate Intrinsic Value, Outstanding, Ending [1] (59,850) $ 266,020
Aggregate Intrinsic Value, Vested [1] 63,860  
Aggregate Intrinsic Value, Vested and expected to vest [1] $ (59,850)  
2000 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, Beginning balance 12,500 117,500
Grants
Terminations
Exercises (105,000)
Outstanding, Ending balance 12,500 12,500
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 270,000 242,500
Grants 48,500
Terminations (12,000) (19,000)
Exercises (15,000) (2,000)
Outstanding, Ending balance 243,000 270,000
Vested 32,500  
Vested and expected to vest 243,000  
Reserved for future grants 13,000  
2017 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, Beginning balance 111,500
Grants 10,000 122,500
Terminations (11,000)
Exercises
Outstanding, Ending balance 121,500 111,500
Vested  
Vested and expected to vest 121,500  
Reserved for future grants 178,500  
[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.