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Long-Term Debt and Short-Term Debt (Details Textual) (USD $)
 9 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Dec. 31, 2011
Dec. 20, 2011
December 20, 2018 [Member]
Sep. 30, 2012
December 20, 2018 [Member]
Oct. 26, 2012
Revolving credit facility [Member]
Sep. 30, 2012
Revolving credit facility [Member]
Sep. 30, 2012
Fixed rate notes [Member]
Sep. 30, 2012
Fixed rate notes [Member]
April 26, 2014 [Member]
Dec. 20, 2011
Fixed rate notes [Member]
April 26, 2014 [Member]
Sep. 30, 2012
Fixed rate notes [Member]
December 20, 2018 [Member]
Dec. 20, 2011
Seven year fixed rate notes [Member]
Oct. 26, 2012
Maximum [Member]
Oct. 26, 2012
Maximum [Member]
Revolving credit facility [Member]
Sep. 30, 2012
Maximum [Member]
Seven year fixed rate notes [Member]
October 26th Fixed rate debt [Member]
Oct. 26, 2012
Minimum [Member]
Sep. 30, 2012
Minimum [Member]
October 26th Fixed rate debt [Member]
Oct. 26, 2012
Minimum [Member]
Revolving credit facility [Member]
Line of Credit Facility [Line Items]                                    
Borrowings $ 100,000,000 $ 100,000,000   $ 20,000,000   $ 100,000,000 $ 100,000,000   $ 40,000,000                  
Line of credit LIBOR rate             0.25%                      
Applicable margin added to the interest rate             2.75%           3.50% 2.25%   2.50%   1.25%
Percentage of fixed interest rate bearing       4.64%           5.39%         4.89%   5.39%  
Annual principal payment of fixed rate notes         4,000,000       5,714,000                  
Expiration date           Oct. 26, 2017     Apr. 26, 2014   Dec. 20, 2018              
Net capitalized loan origination costs             1,308,000 181,000                    
Senior notes maturity period       7 years                            
Line of Credit Facility, Remaining Borrowing Capacity 11,429,000 11,429,000                                
Fixed rate notes 40,000,000                     20,000,000            
Long-Term Debt and Short-Term Debt (Textual) [Abstract]                                    
Method for determining interest rate under revolving credit facility LIBOR plus an applicable margin                                  
Fixed charge coverage ratio previous required minimum   1.25                                
Fixed charge coverage ratio current required minimum   1.00                                
Potential to expand credit facility under credit agreement 35,000,000 35,000,000                                
Amount of credit facility to meet short term cash flow needs $ 10,000,000                                  
Interest rate of available credit facility     6.50%                              
Interest rate of fixed rate notes 5.39%                                  
Interest rate further reduction from available credit facility 4.89%                                  
Interest rate reduction from available credit facility     5.39%