Note 9 - Supplemental Information Relating to Oil and Gas Producing Activities (Unaudited) (Details Textual)	12 Months Ended
Dec. 31, 2016 USD ($) a $ / bbl $ / Mcf	Dec. 31, 2015 USD ($) a $ / bbl $ / Mcf
Proved Undeveloped Carrying Cost	$ 36,200	$ 35,700
Fair Value Inputs, Discount Rate	10.00%	10.00%
Estimate of Proved Reserves Natural Gas Price \| $ / Mcf	1.41	1.37
Estimate of Proved Reserves Crude Oil Price \| $ / bbl	39.33	46.4
Costs Incurred, Acquisition of Oil and Gas Properties with Proved Reserves	$ 0	$ 0
Gas and Oil Area, Undeveloped, Net \| a	46	91

Average adjusted crude oil price used in the estimation of proved reserves.

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- Definition

Average adjusted natural gas price used in the estimation of proved reserves.

+ References

No definition available.

+ Details

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- Definition

Net carrying cost of proved undeveloped acreage that is included in the Company's proved properties.

+ References

No definition available.

+ Details

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- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 18
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62038-109447

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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- Definition

Fractional interest owned based on working interests or other economic arrangements of lease area 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://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (b)

+ Details

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