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Stock Options (Details) (2012 Plan Stock Options, USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock option details        
Maximum exercisable period for options granted     10 years  
Shares available for future grants 800,000   800,000  
Stock-based compensation expense $ 113,000 $ 85,000 $ 366,000 $ 280,000
Stock-based compensation cost, unrecognized, related to non-vested options 947,000   947,000  
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition     1 year 9 months 4 days  
Stock option activity        
Options outstanding at the beginning of the period (in shares)     844,721  
Less:        
Options exercised (in shares)     4,165  
Options forfeited (in shares)     75,951  
Options outstanding at the end of the period (in shares) 764,605   764,605  
Options fully vested and exercisable at the end of the period (in shares) 396,303   396,303  
Stock options, weighted average exercise price        
Options outstanding at the beginning, weighted average exercise price (in dollars per share)     $ 19.08  
Less:        
Options exercised, weighted average exercise price (in dollars per share)     $ 10.40  
Options forfeited, weighted average exercise price (in dollars per share)     $ 19.31  
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 19.11   $ 19.11  
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 23.82   $ 23.82  
Stock options, weighted average remaining contractual term        
Options outstanding at the end, weighted average remaining contractual term     3 years 9 months 14 days  
Options fully vested and exercisable at the end, weighted average remaining contractual term     1 year 10 months 17 days  
Stock options, aggregate intrinsic value        
Options outstanding at the end, aggregate intrinsic value 2,478,000   2,478,000  
Options fully vested and exercisable at the end, aggregate intrinsic value $ 472,000   $ 472,000  
Incentive stock options granted to 10% shareholders
        
Stock option details        
Maximum exercisable period for options granted     5 years