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Shareholders' Equity (Narratives) (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]            
Stock compensation $ 113,000 $ 110,000 $ 250,906 $ 219,240    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 115,252   115,252   63,777 61,642
DividendsCash     2,091,694 1,697,450    
Dividends Payable, Amount Per Share $ 0.543 $ 0.572 $ 0.543 $ 0.572    
Preferred Stock Dividend Rate Percentage         6.30%  
Dividends, Preferred Stock, Cash     $ 53,000