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Note 12 - Debt Obligations (Details) - Estimated Remaining Cash Payments (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Convertible Notes 2017 [Member] | Year One [Member]  
Debt Instrument [Line Items]  
Cash payments related to convertible notes $ 175,880us-gaap_RepaymentsOfConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= bpz_ConvertibleNotes2017Member
/ us-gaap_LongtermDebtTypeAxis
= bpz_YearOneMember
Convertible Notes 2017 [Member]  
Debt Instrument [Line Items]  
Cash payments related to convertible notes 175,880us-gaap_RepaymentsOfConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= bpz_ConvertibleNotes2017Member
Convertible Notes 2015 [Member] | Year One [Member]  
Debt Instrument [Line Items]  
Cash payments related to convertible notes 61,837us-gaap_RepaymentsOfConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= bpz_ConvertibleNotes2015Member
/ us-gaap_LongtermDebtTypeAxis
= bpz_YearOneMember
Convertible Notes 2015 [Member]  
Debt Instrument [Line Items]  
Cash payments related to convertible notes $ 61,837us-gaap_RepaymentsOfConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= bpz_ConvertibleNotes2015Member