Additional annual rental payments receive if lease is continued.

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Area of operating lease oil wells.

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The number of counties.

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Payments for release of surface entry rights.

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Percentage of interest in subsurface rights.

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Sale price of subsurface interest area of land.

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Subsurface interest area of land.

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Area of a real estate property.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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No definition available.

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- Definition

Revenue related to the upstream oil and gas activities, such as exploration, development, and production of crude petroleum.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62246-109447

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Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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The total number of producing oil wells and oil wells capable of production, in which the entity owns an undivided working interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (a)

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Production of proved reserves.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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Revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to certain property. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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Land and Development Costs and Subsurface Interests - Subsurface Interests (Details)	1 Months Ended	3 Months Ended								12 Months Ended
	Nov. 30, 2015 USD ($) item	Dec. 31, 2016 USD ($) a ft²	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) a	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) a ft² county bbl	Dec. 31, 2015 USD ($) a bbl	Dec. 31, 2014 USD ($) a bbl	Dec. 31, 2011
Real Estate Properties [Line Items]
Lease income recognized from oil exploration lease										$ 1,100,000	$ 1,700,000	$ 2,900,000
Area on which royalties received \| a										800
Production of oil \| bbl										50,441	62,745	64,835
Payments for release of surface entry rights										$ 493,000	$ 995,000	$ 4,000
Revenues		$ 27,635,543	$ 12,210,945	$ 12,873,938	$ 18,354,435	$ 19,783,432	$ 8,297,715	$ 7,608,208	$ 7,308,325	$ 71,074,861	42,997,680	$ 36,056,637
Daytona Beach, Florida
Real Estate Properties [Line Items]
Area of a real estate property \| a		9,800								9,800
Lee County, Florida [Member]
Real Estate Properties [Line Items]
Number of oil wells \| item	2
Income Properties
Real Estate Properties [Line Items]
Area of a real estate property \| ft²		1,700,000								1,700,000
Land [Member]
Real Estate Properties [Line Items]
Area of a real estate property \| a		9,800								9,800		99.7
Sales price												$ 8,807,000
Oil exploration
Real Estate Properties [Line Items]
Subsurface interest area of land \| a										500,000
Number of counties \| county										20
Lease term													8 years
Amended oil exploration lease term										The terms of the lease state the Company will receive royalty payments if production occurs, and may receive additional annual rental payments if the lease is continued in years seven and eight.
Under contract to be sold \| 2016 Disposals
Real Estate Properties [Line Items]
Sale price of subsurface interest area of land	$ 24,000,000
Sold \| 2016 Disposals
Real Estate Properties [Line Items]
Sales price		$ 74,300,000								$ 74,300,000
Sold \| 2016 Disposals \| Land [Member]
Real Estate Properties [Line Items]
Area of a real estate property \| a		707.7								707.7
Sales price		$ 13,759,000								$ 13,759,000
Sold \| 2015 Disposals
Real Estate Properties [Line Items]
Sales price						$ 24,300,000					$ 24,300,000
Sold \| 2015 Disposals \| Lee County, Florida [Member]
Real Estate Properties [Line Items]
Area of a real estate property \| a						1,400					1,400
Sales price						$ 920,000					$ 920,000
Sold \| 2015 Disposals \| Land [Member]
Real Estate Properties [Line Items]
Area of a real estate property \| a						114.10					114.10
Sales price						$ 22,529,000					$ 22,529,000
Subsurface Interests [Member]
Real Estate Properties [Line Items]
Oil royalty income recognized						$ 68,000				$ 50,000	$ 68,000	$ 198,000
Subsurface Interests [Member] \| Lee County, Florida [Member]
Real Estate Properties [Line Items]
Interest percentage subsurface rights						50.00%