|
Summary of Significant Accounting Policies - Derivative Financial Instruments (Details) (USD $)
|
12 Months Ended | 1 Months Ended | 1 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
swap
|
Dec. 31, 2007
Interest Rate Swap [Member]
contract
|
Dec. 31, 2007
Interest Rate Swap [Member]
Interest Rate Swap Contract 1 [Member]
|
Dec. 31, 2007
Interest Rate Swap [Member]
Interest Rate Swap Contract 2 [Member]
|
Mar. 31, 2010
Interest Rate Swap [Member]
Interest Rate Swap Contract 3 [Member]
|
Jul. 31, 2011
Interest Rate Swap [Member]
Interest Rate Swap Contract 4 [Member]
|
Sep. 30, 2013
Interest Rate Swap [Member]
Interest Rate Swap Contract 5 [Member]
|
Oct. 31, 2012
Interest Rate Swap [Member]
Interest Rate Swap Contract 5 [Member]
|
Oct. 31, 2012
Interest Rate Swap [Member]
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 | |||||
| Number of swaps | 8 | ||||||||