Notes Payable and Accrued Interest (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Notes Payable and Accrued Interest [Abstract]
Notes payable and accrued interest	$ 104,980,800	$ 77,527,300
Credit Facility [Member]
Notes Payable and Accrued Interest [Abstract]
Credit Facility principal	104,900,000	77,500,000
Credit Facility accrued interest	80,800	27,300
Notes payable and accrued interest	104,980,800	77,527,300
Credit Facility [Abstract]
Credit facility maximum borrowing capacity	130,000,000
Expiration date	Sep. 30, 2015
Unused amount of the credit facility	$ 25,100,000	$ 52,500,000
Weighted average interest rate on credit facility (in hundredths)	3.94%	3.94%