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Note 9 - Investment in Ecuador Property (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 9 - Investment in Ecuador Property (Details) [Line Items]    
Ownership Percentage, Oil and Gas Exploration Block 100.00%bpz_OwnershipPercentageOilAndGasExplorationBlock  
Long-term Debt [Member] | Santa Elena Property [Member]    
Note 9 - Investment in Ecuador Property (Details) [Line Items]    
Other Commitment $ 1.0us-gaap_OtherCommitment
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_LongTermDebtMember
/ us-gaap_OtherCommitmentsAxis
= bpz_SantaElenaPropertyMember		  
Santa Elena Property [Member]    
Note 9 - Investment in Ecuador Property (Details) [Line Items]    
Ownership Percentage, Oil and Gas Exploration Block 10.00%bpz_OwnershipPercentageOilAndGasExplorationBlock
/ us-gaap_OtherCommitmentsAxis
= bpz_SantaElenaPropertyMember		 10.00%bpz_OwnershipPercentageOilAndGasExplorationBlock
/ us-gaap_OtherCommitmentsAxis
= bpz_SantaElenaPropertyMember
Other Commitment $ 4.8us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= bpz_SantaElenaPropertyMember		 $ 4.8us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= bpz_SantaElenaPropertyMember