Interest Rate Derivative Agreements (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Bank of New York Mellon [Member]
Derivative [Line Items]
Derivative, Purchase Date	Sep. 02, 2010
Notional Amount of Interest Rate Derivatives	$ 31,936,667
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	Sep. 01, 2017
Deriviative at purchase price	921,000
Barclays Bank PLC [Member]
Derivative [Line Items]
Derivative, Purchase Date	Sep. 02, 2010
Notional Amount of Interest Rate Derivatives	31,936,667
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	Sep. 01, 2017
Deriviative at purchase price	845,600
Royal Bank of Canada [Member]
Derivative [Line Items]
Derivative, Purchase Date	Sep. 02, 2010
Notional Amount of Interest Rate Derivatives	31,936,667
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	Sep. 01, 2017
Deriviative at purchase price	$ 928,000