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Summary of Significant Accounting Policies (Details 4) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net Income (Loss) Per Share        
Denominator for basic net income (loss) per share - weighted average shares 13,660,000 13,602,000 13,657,000 13,607,000
Effect of dilutive securities: Stock options 27,000   29,000  
Denominator for diluted net income (loss) per share - adjusted weighted average shares 13,687,000 13,602,000 13,686,000 13,607,000
Options
        
Net Income (Loss) Per Share        
Options not included in computation because they were anti-dilutive 1,155,000   1,239,000  
Weighted average exercise of price of options outstanding that were anti-dilutive $ 3.19   $ 3.33