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Note 12 - Debt Obligations (Details) - Debt Maturities (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Debt Maturities [Abstract]  
2015 $ 228,600us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Total scheduled debt maturities $ 228,600bpz_LongTermDebtMaturitiesRepaymentsOfPrincipal