Aggregate of revenue from sale of fill dirt and other real estate revenue not otherwise specified in the taxonomy.

No definition available.

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- Definition

The gain (loss) on sale of real estate or properties that were intended to be sold or held for capital appreciation or rental income, after tax, per each share of common stock outstanding during the reporting period.

+ References

No definition available.

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Area of land sold in the reporting period.

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No definition available.

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Period of from end of prior lease year of the lessor's leasing arrangement, contingent rental payment is due, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Period of term of the lessor's leasing arrangement, after which additional annual rental payments may be received, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Period of term of the lessor's leasing arrangement, after which the lessee has the option to terminate the lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Lessor, Operating Lease, Drilling Penalty, Amount

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No definition available.

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- Definition

Lessor, Operating Lease, Lease Payment, Amount

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No definition available.

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- Definition

Lessor, Operating Lease, Lease Payment and Drilling Penalty, Amount

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No definition available.

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- Definition

The number of counties in which the entity owns subsurface interests as of balance sheet date.

+ References

No definition available.

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- Definition

The revenue from real estate operations recognized for cash payments received for the release of surface entry rights during the reporting period.

+ References

No definition available.

+ Details

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- Definition

Are of land for which the surface entry rights were released.

+ References

No definition available.

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- References

No definition available.

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- Definition

Production of proved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 235
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-Paragraph 5
-Subparagraph (e)
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- Definition

Area of land held.

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No definition available.

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Area spaced or assigned to productive wells in which a working interest is owned.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
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- Definition

Lease area in which a working interest is owned and on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (b)

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- References

No definition available.

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- Definition

Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 30
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-Paragraph 3
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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- References

No definition available.

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The cash inflow associated with the collection of receivables arising from the lease of real estate, equipment or other fixed assets for a specified time in exchange for payment, usually in the form of rent; excludes proceeds from sales-type lease transactions, which are classified as operating activities.

+ References

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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- Definition

Indicates type of revenue from product and service.

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-SubTopic 10
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LAND AND SUBSURFACE INTERESTS - Subsurface Interests (Details)		12 Months Ended
	Feb. 28, 2019 a	Dec. 31, 2018 USD ($) a county $ / shares bbl	Dec. 31, 2017 USD ($) a $ / shares bbl	Dec. 31, 2016 USD ($) a bbl	Sep. 20, 2017	Dec. 31, 2011
Subsurface interests
Acres sold \| a	1,800
Lease payments on the respective acreages and drilling penalties received
Lease Payment		$ 807,000
Lease income
Rent payment received		705,000
Over Lease Term		40,911,000	$ 32,278,000	$ 26,384,000
Fill dirt excavation agreements
Lease income
Fill dirt and other revenue		$ 0	$ 250,000
Subsurface Interests
Subsurface interests
Acres sold \| a			38,750
Revenue from contract with customer, including assessed tax			$ 2,100,000
Gain on Sale			$ 2,080,000
After tax gain on sale (in dollars per share) \| $ / shares			$ 0.23
Lease income
Number of acres with operating oil wells \| a		800	800	800
Oil exploration
Subsurface interests
Period of extended lease term					5 years
Period of lease term after which lessee has option to terminate lease		1 year
Lease payments on the respective acreages and drilling penalties received
Lease Payment			$ 10,633,805
Drilling Penalty			2,125,000
Lease income
Period from end of prior lease year payment for drilling penalty is due		30 days
Rent payment received		$ 855,000
Lease payment and drilling penalty		957,000
Over Lease Term		$ 807,000	807,000	$ 1,100,000
Hendry County
Lease income
Area of land for which surface entry rights were released \| a		40
Minimum \| Oil exploration
Lease income
Period of lease term after which additional rental payments may be received		9 years
Maximum \| Oil exploration
Subsurface interests
Lease term		8 years			13 years	8 years
Lease income
Period of lease term after which additional rental payments may be received		13 years
Surface land over subsurface interests
Subsurface interests
Acres \| a		455,000
Number of counties in which Subsurface Interests are owned \| county		20
Gain on Sale		$ 435,000
After tax gain on sale (in dollars per share) \| $ / shares		$ 0.06
Lease income
Revenue recognized for cash payments for the release of surface entry rights		$ 73,000	0	493,000
Area of land for which surface entry rights were released \| a		600
Surface land over subsurface interests \| Hendry County
Subsurface interests
Revenue from contract with customer, including assessed tax		$ 320,000
Real Estate Operations
Lease income
Over Lease Term		980,000	900,000	1,307,000
Real Estate Operations \| Subsurface Interests
Subsurface interests
Revenue from contract with customer, including assessed tax		$ 72,000	$ 86,000	$ 50,000
Type of revenue		us-gaap:RoyaltyMember	us-gaap:RoyaltyMember	us-gaap:RoyaltyMember
Lease income
Oil production volume \| bbl		39,186	60,287	50,441
Real Estate Operations \| Surface land over subsurface interests
Subsurface interests
Revenue from contract with customer, including assessed tax		$ 185,000
Lease Year 1 - 9/23/2011 - 9/22/2012 \| Lee and Hendry County \| Oil exploration
Lease payments on the respective acreages and drilling penalties received
Acreage \| a		136,000
Lease Payment		$ 913,657
Lease Year 2 - 9/23/2012 - 9/22/2013 \| Lee and Hendry County \| Oil exploration
Lease payments on the respective acreages and drilling penalties received
Acreage \| a		136,000
Lease Payment		$ 922,114
Lease Year 3 - 9/23/2013 - 9/22/2014 \| Hendry County \| Oil exploration
Lease payments on the respective acreages and drilling penalties received
Acreage \| a		82,000
Lease Payment		$ 3,293,000
Drilling Penalty		$ 1,000,000
Lease Year 4 - 9/23/2014 - 9/22/2015 \| Hendry County \| Oil exploration
Lease payments on the respective acreages and drilling penalties received
Acreage \| a		42,000
Lease Payment		$ 1,866,146
Drilling Penalty		$ 600,000
Lease Year 5 - 9/23/2015 - 9/22/2016 \| Hendry County \| Oil exploration
Lease payments on the respective acreages and drilling penalties received
Acreage \| a		25,000
Lease Payment		$ 1,218,838
Drilling Penalty		$ 175,000
Lease Year 6 - 9/23/2016 - 9/22/2017 \| Hendry County \| Oil exploration
Lease payments on the respective acreages and drilling penalties received
Acreage \| a		15,000
Lease Payment		$ 806,683
Drilling Penalty		$ 150,000
Lease Year 7 - 9/23/2017 - 9/22/2018 \| Hendry County \| Oil exploration
Lease payments on the respective acreages and drilling penalties received
Acreage \| a		15,000
Lease Payment		$ 806,683
Drilling Penalty		$ 50,000
Lease Year 8 - 9/23/2018 - 9/22/2019 \| Hendry County \| Oil exploration
Lease payments on the respective acreages and drilling penalties received
Acreage \| a		15,000
Lease Payment		$ 806,684
Drilling Penalty		$ 150,000