Business Segment Data - Summary of Operations in Different Segments (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 6,372,495	$ 3,557,175	$ 16,183,724	$ 12,398,827
Operating Income (Loss)	2,469,455	(982,834)	3,405,413	633,496
Depreciation and Amortization	738,537	509,242	2,146,515	1,508,801
Capital Expenditures	29,424,729	1,733,718	57,366,684	8,661,344
Identifiable Assets	228,724,403		228,724,403		184,696,900
Operating Segments [Member] | Income Properties [Member]
Segment Reporting Information [Line Items]
Revenues	3,356,937	2,177,895	9,621,147	6,390,847
Operating Income (Loss)	2,929,596	1,978,185	8,582,225	5,871,943
Depreciation and Amortization	680,868	440,939	1,973,002	1,296,296
Capital Expenditures	11,706,215	1,718,374	39,516,889	8,608,494
Identifiable Assets	158,068,190		158,068,190		130,726,326
Operating Segments [Member] | Commercial Mortgage Loan [Member]
Segment Reporting Information [Line Items]
Revenues	644,198		644,198
Operating Income (Loss)	644,198		644,198
Depreciation and Amortization
Capital Expenditures	17,655,367		17,655,367
Identifiable Assets	18,046,598		18,046,598
Operating Segments [Member] | Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Revenues	1,369,397	421,983	2,010,722	2,417,367
Operating Income (Loss)	1,194,986	278,845	1,530,570	1,885,454
Depreciation and Amortization
Capital Expenditures
Identifiable Assets	32,684,740		32,684,740		34,161,944
Operating Segments [Member] | Golf Operations [Member]
Segment Reporting Information [Line Items]
Revenues	981,118	861,326	3,758,629	3,443,984
Operating Income (Loss)	(340,219)	(453,102)	(395,709)	(766,977)
Depreciation and Amortization	51,600	42,940	151,593	130,147
Capital Expenditures	47,747		133,567
Identifiable Assets	3,159,984		3,159,984		3,230,225
Operating Segments [Member] | Agriculture and Other [Member]
Segment Reporting Information [Line Items]
Revenues	20,845	95,971	149,028	146,629
Operating Income (Loss)	(12,976)	67,441	28,753	(19,791)
Depreciation and Amortization	6,069	25,363	21,920	82,358
Capital Expenditures	15,400	15,344	60,861	52,850
Identifiable Assets	16,764,891		16,764,891		16,578,405
Operating Segments [Member] | General and Corporate Expense [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (1,946,130)	$ (2,854,203)	$ (6,984,624)	$ (6,337,133)