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Note 2 - Oil and Gas Leases - Company's Royalty and Working Interests Share (Details) - Boe	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Natural Gas, Per Thousand Cubic Feet [Member]
Net oil or gas produced (Barrel of Oil Equivalent)	42,927	48,758
Crude Oil and NGL [Member]
Net oil or gas produced (Barrel of Oil Equivalent)	8,169	8,412

X

- Definition

Energy measure of oil and natural gas production reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1204

+ Details

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- Details

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