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Summary of Significant Accounting Policies - (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Impairment of Long-Lived Assets    
Impairment losses on long-lived assets $ 0 $ 0
Advertising Costs    
Advertising expense $ 42,000 $ 183,000
Net Income Per Share    
Denominator for basic net income per share - weighted average shares 12,044,000 12,635,000
Effect of dilutive securities: Stock options and restricted stock units 172,000 238,000
Denominator for diluted net income per share - weighted average shares 12,216,000 12,873,000
Stock Options    
Net Income Per Share    
Options not included in computation because they were anti-dilutive 613,000 592,000
Weighted average exercise of price of options outstanding that were anti-dilutive $ 3.79 $ 4.24