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Note 2 - Company's Royalty and Working Interests Share (Details)
 12 Months Ended
Dec. 31, 2014
Boe
Dec. 31, 2013
Boe
Crude Oil and NGL [Member]    
Net oil or gas produced 10,593us-gaap_ProductionBarrelsOfOilEquivalents1
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_CrudeOilAndNGLPerBarrelMember		 13,273us-gaap_ProductionBarrelsOfOilEquivalents1
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_CrudeOilAndNGLPerBarrelMember
Natural Gas, Per Thousand Cubic Feet [Member]    
Net oil or gas produced 46,457us-gaap_ProductionBarrelsOfOilEquivalents1
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_NaturalGasPerThousandCubicFeetMember		 42,117us-gaap_ProductionBarrelsOfOilEquivalents1
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_NaturalGasPerThousandCubicFeetMember