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Earnings and Dividends per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Computational components of basic and diluted earnings per share    
Basic net income and earnings per share, Numerator (Income) $ 2,208 $ 2,045
Basic net income and earnings per share, Denominator (Shares) 17,078,192 14,527,371
Basic net income and earnings per share, Per Share Amount $ 0.13 $ 0.14
Effect of dilutive securities and notes:    
Common stock equivalents arising from stock options and employee stock purchase plan, Numerator (Income)     
Common stock equivalents arising from stock options and employee stock purchase plan, Denominator (Shares) 696,000 211,000
Common stock equivalents arising from stock options and employee stock purchase plan, Per Share Amount $ (0.01)  
Subordinated convertible promissory notes, Numerator (Income)   86
Subordinated convertible promissory notes, Denominator (shares)   2,390,000
Subordinated convertible promissory notes, Per Share Amount   $ (0.02)
Net Income (Loss) Available to Common Stockholders, Diluted, Total $ 2,208 $ 2,131
Weighted Average Number of Shares Outstanding, Diluted, Total 17,774,051 17,128,134
Diluted earnings and earnings per share, Per Share Amount $ 0.12 $ 0.12