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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity [Abstract]  
Schedule of activity under the stock option plans

 

  2000 Plan  2010 Plan  Weighted Average Exercise Price  Aggregate Intrinsic Value 
Outstanding at December 31, 2012  163,500   49,500  $3.13  $185,000 
Grants  0   26,000  $4.67     
Terminations  0   (1,000) $3.15     
Exercises  (6,000)  (1,000) $3.11     
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 
Exercisable at December 31, 2015  131,500   41,500  $2.90  $803,000 
Reserved for future grants  0   189,500         

 
Schedule of fair value stock option grant using Black-Scholes option valuation model with the weighted-average assumptions

 

  2015  2014  2013 
Risk-free interest rate  2.0%  2.0%  1.6%
Dividend yield  0%  0%  0%
Expected volatility  47%  49%  49%
Expected life  6 years   6 years   6 years