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Earnings and Dividends per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Computational components of basic and diluted earnings per share        
Net income loss available to common stockholders basic $ 3,268 $ 2,319 $ 7,798 $ 5,530
Basic net income and earnings per share 14,630,264 14,371,752 14,591,325 14,340,119
Basic net income and earnings per share, Amount $ 0.22 $ 0.16 $ 0.53 $ 0.39
Effect of dilutive securities and notes:        
Common stock equivalents arising from stock options and employee stock purchase plan            
Common stock equivalents arising from stock options and employee stock purchase plan, shares 371 163 290 144
Common stock equivalents arising from stock options and employee stock purchase plan per share            
Subordinated convertible promissory notes 82 95 250 285
Subordinated convertible promissory notes 2,257 2,622 2,318 2,647
Subordinated convertible promissory notes per, share $ (0.03) $ (0.02) $ (0.06) $ (0.05)
Net income loss available to common stockholders diluted $ 3,350 $ 2,414 $ 8,048 $ 5,815
Diluted net income and earnings per share 17,258,552 17,157,305 17,199,337 17,130,767
Earnings Per Share, Diluted $ 0.19 $ 0.14 $ 0.47 $ 0.34