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Note 14 - Stockholders' Equity (Details) - Earnings (Loss) Per Share of Common Stock (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 14 - Stockholders' Equity (Details) - Earnings (Loss) Per Share of Common Stock [Line Items]                      
Net loss (in Dollars) $ (56,495)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1] $ (45,292)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [2] $ (2,549)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (3,570)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (9,966)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (15,321)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (19,640)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (12,784)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (107,906)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (57,711)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (39,089)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic weighted average common shares outstanding 116,453us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 116,399us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 116,342us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 116,042us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 116,035us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 116,009us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 115,935us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 115,788us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 116,311us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 115,943us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 115,631us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares from assumed conversion of dilutive share based awards                 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average common shares outstanding 116,453us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 116,399us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 116,342us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 116,042us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 116,035us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 116,009us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 115,935us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 115,788us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 116,311us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 115,943us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 115,631us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net loss per share (in Dollars per share) $ (0.49)us-gaap_EarningsPerShareBasic [1] $ (0.39)us-gaap_EarningsPerShareBasic [2] $ (0.02)us-gaap_EarningsPerShareBasic $ (0.03)us-gaap_EarningsPerShareBasic $ (0.09)us-gaap_EarningsPerShareBasic $ (0.13)us-gaap_EarningsPerShareBasic $ (0.17)us-gaap_EarningsPerShareBasic $ (0.11)us-gaap_EarningsPerShareBasic $ (0.93)us-gaap_EarningsPerShareBasic $ (0.50)us-gaap_EarningsPerShareBasic $ (0.34)us-gaap_EarningsPerShareBasic
Diluted net loss per share (in Dollars per share) $ (0.49)us-gaap_EarningsPerShareDiluted [1] $ (0.39)us-gaap_EarningsPerShareDiluted [2] $ (0.02)us-gaap_EarningsPerShareDiluted $ (0.03)us-gaap_EarningsPerShareDiluted $ (0.09)us-gaap_EarningsPerShareDiluted $ (0.13)us-gaap_EarningsPerShareDiluted $ (0.17)us-gaap_EarningsPerShareDiluted $ (0.11)us-gaap_EarningsPerShareDiluted $ (0.93)us-gaap_EarningsPerShareDiluted $ (0.50)us-gaap_EarningsPerShareDiluted $ (0.34)us-gaap_EarningsPerShareDiluted
Antidilutive Stock Option [Member]                      
Note 14 - Stockholders' Equity (Details) - Earnings (Loss) Per Share of Common Stock [Line Items]                      
Excluded shares                 7,707us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DebtInstrumentAxis
= bpz_AntidilutiveStockOptionMember		 [3],[4] 7,413us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DebtInstrumentAxis
= bpz_AntidilutiveStockOptionMember		 [3],[4] 6,723us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DebtInstrumentAxis
= bpz_AntidilutiveStockOptionMember		 [3],[4]
Convertible Notes 2017 [Member]                      
Note 14 - Stockholders' Equity (Details) - Earnings (Loss) Per Share of Common Stock [Line Items]                      
Excluded shares                 42,108us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DebtInstrumentAxis
= bpz_ConvertibleNotes2017Member		 [3] 35,878us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DebtInstrumentAxis
= bpz_ConvertibleNotes2017Member		 [3]    [3]
Convertible Notes 2015 [Member]                      
Note 14 - Stockholders' Equity (Details) - Earnings (Loss) Per Share of Common Stock [Line Items]                      
Excluded shares                 10,122us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DebtInstrumentAxis
= bpz_ConvertibleNotes2015Member		 [3] 14,516us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DebtInstrumentAxis
= bpz_ConvertibleNotes2015Member		 [3] 28,890us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DebtInstrumentAxis
= bpz_ConvertibleNotes2015Member		 [3]
[1] Includes asset impairments of $17.0 million and an increase to the deferred income tax valuation allowance of $32.3 million.
[2] Includes asset impairments of $41.0 million and an increase to the deferred income tax valuation allowance of $9.9 million.
[3] Inclusion of the shares for these awards would have had an antidilutive effect.
[4] Inclusion of the performance share units for these awards would have had an antidilutive effect. The actual number of performance share units earned may range from 0% to 200%.