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Stockholders' Equity (Details) - Stock Option [Member] - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Exercises 15,000 14,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]        
Outstanding balance, Weighted Average Exercise     $ 3.57 $ 3.42
Grants, Weighted Average Exercise     6.98 7.40
Terminations, Weighted Average Exercise     6.19 4.95
Exercises, Weighted Average Exercise     5.59 4.29
Outstanding balance, Weighted Average Exercise $ 3.97   3.97 $ 3.57
Exercisable, Weighted Average Exercise $ 2.62   $ 2.62  
Aggregate Intrinsic Value        
Outstanding balance, Aggregate Intrinsic Value     $ 945,000 $ 364,000
Outstanding balance, Aggregate Intrinsic Value $ 981,000   981,000 $ 945,000
Exercisable, Aggregate Intrinsic Value $ 802,000   $ 802,000  
2000 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Beginning Balance, Outstanding     131,500 157,500
Grants     0 0
Terminations     0 0
Exercises     0 (26,000)
Ending balance, Outstanding 131,500   131,500 131,500
Exercisable 131,500   131,500  
Aggregate Intrinsic Value        
Reserved for future grants 0   0  
2010 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Beginning Balance, Outstanding     106,500 95,500
Grants     44,000 16,000
Terminations     (5,000) (3,000)
Exercises     (16,000) (2,000)
Ending balance, Outstanding 129,500   129,500 106,500
Exercisable 25,500   25,500  
Aggregate Intrinsic Value        
Reserved for future grants 150,500   150,500