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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2016
Stockholders' Equity [Abstract]  
Schedule of activity under the stock option plans
    2000 Plan     2010 Plan     Weighted Average Exercise     Aggregate Intrinsic Value  
Outstanding at December 31, 2013     157,500       73,500     $ 3.30     $ 223,000  
Grants     0       25,000     $ 4.69          
Terminations     0       (2,000 )   $ 5.75          
Exercises     0       (1,000 )   $ 3.15          
Outstanding at December 31, 2014     157,500       95,500     $ 3.42     $ 364,000  
Grants     0       16,000     $ 7.40          
Terminations     0       (3,000 )   $ 4.95          
Exercises     (26,000 )     (2,000 )   $ 4.29          
Outstanding at December 31, 2015     131,500       106,500     $ 3.57     $ 945,000  
Grants     0       37,000     $ 6.77          
Terminations     0       (4,000 )   $ 6.60          
Exercises     0       (1,000 )   $ 3.15          
Outstanding at June 30, 2016     131,500       138,500     $ 3.96     $ 793,000  
Exercisable at June 30, 2016     131,500       40,500     $ 2.90     $ 689,000  
Reserved for future grants     0       156,500                  
Schedule of fair value stock option grant using Black-Scholes option valuation model with the weighted-average assumptions
    2016     2015     2014  
Risk-free interest rate     2.0 %     2.0 %     2.0 %
Dividend yield     0 %     0 %     0 %
Expected volatility     47 %     47 %     49 %
Expected life     6 years       6 years       6 years