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Long-Term Debt and Short-Term Debt (Details Textual) (USD $)
 6 Months Ended 9 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
December 20, 2018 [Member]
Dec. 20, 2011
December 20, 2018 [Member]
Jun. 30, 2012
Revolving Credit Facility [Member]
Jun. 30, 2012
Fixed Rate Notes [Member]
Jun. 30, 2012
Fixed Rate Notes [Member]
April 26, 2014 [Member]
Dec. 20, 2011
Fixed Rate Notes [Member]
April 26, 2014 [Member]
Jun. 30, 2012
Fixed Rate Notes [Member]
December 20, 2018 [Member]
Dec. 21, 2010
Maximum [Member]
Dec. 21, 2010
Minimum [Member]
Line of Credit Facility [Line Items]                        
Borrowings $ 100,000,000       $ 20,000,000 $ 100,000,000   $ 40,000,000        
Line of credit LIBOR rate           0.25%            
Applicable margin added to the interest rate           3.00%         3.50% 2.50%
Expiration date           Dec. 21, 2014            
Percentage of fixed interest rate bearing         4.64%       5.39%      
Annual principal payment of fixed rate notes       4,000,000       5,714,000        
Maturity date for annual payment               Apr. 26, 2014   Dec. 20, 2018    
Net capitalized loan origination costs           1,458,000 221,000          
Senior notes maturity period 7 years                      
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 expected   1.25                    
Fixed charge coverage ratio current required minimum   1.00                    
Increase fixed charge coverage ratio starting October 1, 2012   1.25                    
Line of credit facility remaining borrowing capacity minimum   10,000,000                    
Potential to expand credit facility under credit agreement 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 reduction from available credit facility     5.39%