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Note 5 - Receivables, Accounts Payable and Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	46 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Note 5 - Receivables, Accounts Payable and Accrued Liabilities (Details) [Line Items]
Accounts Receivable, Net, Current	$ 1,922us-gaap_AccountsReceivableNetCurrent	$ 1,922us-gaap_AccountsReceivableNetCurrent	$ 21,630us-gaap_AccountsReceivableNetCurrent
Income Taxes Receivable, Current	2,136us-gaap_IncomeTaxesReceivable	2,136us-gaap_IncomeTaxesReceivable	2,134us-gaap_IncomeTaxesReceivable
Value-added Tax Rate	18.00%bpz_ValueAddedTaxRate	18.00%bpz_ValueAddedTaxRate
Accrued Liabilities, Current	6,524us-gaap_AccruedLiabilitiesCurrent	6,524us-gaap_AccruedLiabilitiesCurrent	11,246us-gaap_AccruedLiabilitiesCurrent
Marine Subsidiary [Member] \| Accounts Receivable - Other [Member]
Note 5 - Receivables, Accounts Payable and Accrued Liabilities (Details) [Line Items]
Accounts Receivable, Net, Current	300	300	7,000
Accounts Receivable - Other [Member]
Note 5 - Receivables, Accounts Payable and Accrued Liabilities (Details) [Line Items]
Accounts Receivable, Net, Current	$ 449	$ 449	$ 7,097

Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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