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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Stockholders Equity [Abstract]  
Summary of stock option activity and changes

  2000 Plan  2010 Plan  Weighted Average Exercise Price  Aggregate Intrinsic Value 
Outstanding at December 31, 2011  186,500   49,500  $3.19  $344,000 
Grants  0   2,000  $5.93     
Terminations  (8,000)  (2,000) $4.75     
Exercises  (15,000)  0  $3.39     
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 
                 
Exercisable at December 31, 2014  157,500   42,500  $3.08  $357,000 
                 
Reserved for future grants  0   202,500         
Fair value stock-based option awards granted using Black-Scholes option valuation model

 

  2014  2013  2012 
Risk-free interest rate  2.0%  1.6%  0.97%
Dividend yield  0%  0%  0%
Expected volatility  49%  49%  48.7%
Expected life  6 years   6 years   6.5 years