Note 2 - Oil and Gas Leases - Company's Royalty and Working Interests Share (Details) - Boe	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Natural Gas, Per Thousand Cubic Feet [Member]
Net oil or gas produced (Barrel of Oil Equivalent)	48,959	50,304
Crude Oil and NGL [Member]
Net oil or gas produced (Barrel of Oil Equivalent)	8,447	11,145

Energy measure of oil and natural gas production reserves.

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

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