Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Derivative Financial Instruments (Details)

v2.4.0.6
Summary of Significant Accounting Policies - Derivative Financial Instruments (Details) (Interest Rate Swap [Member], USD $)
 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2007
contract
Dec. 31, 2007
Interest Rate Swap Contract 1 [Member]
Dec. 31, 2007
Interest Rate Swap Contract 2 [Member]
Mar. 31, 2010
Interest Rate Swap Contract 3 [Member]
Jul. 31, 2011
Interest Rate Swap Contract 4 [Member]
Dec. 31, 2012
Interest Rate Swap Contract 5 [Member]
Oct. 31, 2012
Interest Rate Swap Contract 5 [Member]
Oct. 31, 2012
Interest Rate Swap Contract 6 [Member]
Swap
Derivative [Line Items]                
Number of instruments held 2             2
Initial notional amount of interest rate swaps   $ 13,080,607 $ 3,256,395 $ 27,900,000 $ 38,571,429   $ 16,750,000 $ 25,377,063
Interest rate swaps, variable to fixed interest rates   5.40% 5.30% 6.99% 1.965%   1.71% 3.70%
Future increase in notional amount           $ 42,247,327    
Term of interest rate swap contract 15 years     14 years 5 years     8 years