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Stockholders' Equity (Details) - Stock Option [Member] - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
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 $ 3.30
Grants, Weighted Average Exercise 6.77 7.40 4.69
Terminations, Weighted Average Exercise 6.60 4.95 5.75
Exercises, Weighted Average Exercise 3.15 4.29 3.15
Outstanding balance, Weighted Average Exercise 3.96 $ 3.57 $ 3.42
Exercisable, Weighted Average Exercise $ 2.90    
Aggregate Intrinsic Value      
Outstanding balance, Aggregate Intrinsic Value $ 945,000 $ 364,000 $ 223,000
Outstanding balance, Aggregate Intrinsic Value 793,000 $ 945,000 $ 364,000
Exercisable, Aggregate Intrinsic Value $ 689,000    
2000 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Beginning Balance, Outstanding 131,500 157,500 157,500
Grants 0 0 0
Terminations 0 0 0
Exercises 0 (26,000) 0
Ending balance, Outstanding 131,500 131,500 157,500
Exercisable 131,500    
Aggregate Intrinsic Value      
Reserved for future grants 0    
2010 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Beginning Balance, Outstanding 106,500 95,500 73,500
Grants 37,000 16,000 25,000
Terminations (4,000) (3,000) (2,000)
Exercises (1,000) (2,000) (1,000)
Ending balance, Outstanding 138,500 106,500 95,500
Exercisable 40,500    
Aggregate Intrinsic Value      
Reserved for future grants 156,500