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Note 14 - Stockholders' Equity (Details) - Performance Stock Units Activity (USD $)
0 Months Ended 12 Months Ended
Feb. 20, 2014
Dec. 31, 2014
Note 14 - Stockholders' Equity (Details) - Performance Stock Units Activity [Line Items]    
Granted 225,695us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Relative Performance Stock Units [Member]    
Note 14 - Stockholders' Equity (Details) - Performance Stock Units Activity [Line Items]    
Outstanding at the beginning of the year   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Outstanding at the beginning of the year   $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Granted   225,695us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Granted   $ 2.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Vested   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Vested   $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Forfeited or expired   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Forfeited or expired   $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Outstanding at the end of the year   225,695us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Outstanding at the end of the year   $ 2.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_RelativePerformanceStockUnitsMember
Absolute Performance Stock Units [Member]    
Note 14 - Stockholders' Equity (Details) - Performance Stock Units Activity [Line Items]    
Outstanding at the beginning of the year   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember
Outstanding at the beginning of the year   $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember
Granted   225,694us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember
Granted   $ 0.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember
Vested   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember
Vested   $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember
Forfeited or expired   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember
Forfeited or expired   $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember
Outstanding at the end of the year   225,694us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember
Outstanding at the end of the year   $ 0.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bpz_AbsolutePerformanceStockUnitsMember