Land and Subsurface Interests - Additional Information (Detail) (USD $)	0 Months Ended			1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended					1 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended			6 Months Ended		0 Months Ended		0 Months Ended		6 Months Ended
	Dec. 21, 2013	Sep. 22, 2013 acre	Sep. 30, 2012	Sep. 30, 2013 Payments	Jun. 30, 2013 acre	Jun. 30, 2012	Jun. 30, 2013 acre	Dec. 31, 2013 acre Country bbl sqft	Dec. 31, 2012 bbl	Dec. 31, 2011 acre bbl	Dec. 31, 2010	Dec. 31, 2009	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2013 Minimum [Member]	Dec. 04, 2013 RaceTrac [Member]	Dec. 31, 2013 RaceTrac [Member]	Dec. 04, 2013 RaceTrac [Member] Maximum [Member]	Dec. 19, 2013 Intracoastal Bank [Member]	Dec. 21, 2013 CarMax [Member]	Jun. 30, 2012 Interstate [Member]	Dec. 31, 2013 Land [Member] acre	Dec. 04, 2013 Land [Member] RaceTrac [Member] acre	Dec. 04, 2013 Land [Member] Williamson Crossing [Member] acre	Dec. 19, 2013 Land [Member] Intracoastal Bank [Member] acre	Dec. 21, 2013 Land [Member] CarMax [Member] acre	Jun. 30, 2012 Land [Member] Interstate [Member] acre
Real Estate Properties [Line Items]
Area of land sold								740,000													11.655	3.405	23	2.02	6.23	16.6
Revenue from land sold								$ 3,000,000							$ 1,300,000			$ 640,000	$ 1,050,000	$ 618,000
Revenue per acre															382,000			317,000	168,500	37,000
Gain (Loss) from sale of land	416,236							(26,367)	78,455													244,000		581,000	1,000,000	573,000
Reimbursement by Williamson for RaceTrac																	976,500
Reimbursement period															5 years
Cash held in escrow related to the improvements and classified as restricted cash on the consolidated balance sheet								283,500
Adjustment for impairment																0
Loss on sale of land																									416,000
Impairment charges							616,000	616,278		6,618,888
Area of land used for transaction					3.21		3.21
Commitment to fund for road construction costs												1,125,000
Road construction costs amount paid											554,196
Liability recorded for road construction cost											570,804
Income from construction cost						730,000
Reversal of the remaining commitment and a reimbursement						160,000
Subsurface interest area of land								490,000
Subsurface Interest in number of countries								20
Area on which royalties received								800
Oil royalty income recognized								267,693	286,536	228,494
Production of oil								88,782	81,441	104,221
Oil exploration lease period		8 years								8 years
Oil exploration lease covering		82,000								136,000
Bonus rental payment received			922,114	3,293,000						913,657
Number of payments				2
Amount recognized into income				1,830,000
Area removed from exploration lease		54,000
Duration of payment during lease period								12 months
Non refundable payment				1,000,000
Additional annual rental payments receive if lease is continued													8 years	4 years
Lease income recognized from oil exploration lease								$ 1,600,000	$ 919,000	$ 251,000