Business Segment Data - Summary of Operations in Different Segments (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Income Properties	$ 5,034,090	$ 3,864,632	$ 13,426,817	$ 10,821,121
Commercial Loan Investments	546,640	382,087	1,816,834	1,581,746
Real Estate Operations	1,748,398	8,781,759	3,976,340	11,184,591
Golf Operations	949,083	994,651	3,935,076	3,844,428
Agriculture and Other Income	19,504	182,731	59,181	258,052
Total Revenues	8,297,715	14,205,860	23,214,248	27,689,938
Operating Income (Loss)	5,143,440	6,018,340	8,823,488	10,602,508
Depreciation and Amortization	1,417,129	886,618	3,644,620	2,505,007
Capital Expenditures	51,605,489	15,952,004	62,634,148	49,283,362
Identifiable Assets	333,357,568		333,357,568		$ 276,592,448
Income Properties [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	4,036,330	3,407,763	11,105,324	9,539,741
Depreciation and Amortization	1,335,214	815,673	3,413,024	2,301,316
Capital Expenditures	25,596,355	5,329,898	35,610,312	21,566,004
Identifiable Assets	211,143,491		211,143,491		190,087,575
Commercial Loan Investments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	546,640	382,087	1,816,834	1,581,746
Capital Expenditures	14,500,000	10,450,744	15,394,879	27,399,082
Identifiable Assets	38,455,112		38,455,112		30,274,302
Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	1,431,785	5,209,677	2,755,151	7,166,932
Capital Expenditures	11,489,272		11,489,272
Identifiable Assets	55,858,598		55,858,598		43,833,515
Golf Operations [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(406,386)	(315,138)	(266,237)	(310,581)
Depreciation and Amortization	68,712	60,369	194,618	174,942
Capital Expenditures	2,045	138,854	108,462	195,015
Identifiable Assets	3,291,350		3,291,350		3,639,903
Agriculture and Other Income [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(31,980)	148,573	(90,649)	113,362
Depreciation and Amortization	13,203	10,576	36,978	28,749
Capital Expenditures	17,817	32,508	31,223	123,261
Identifiable Assets	24,609,017		24,609,017		$ 8,757,153
General and Corporate Expense [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (432,949)	$ (2,814,622)	$ (6,496,935)	$ (7,488,692)