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Note 18 - Standby Costs (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Standby Costs [Abstract]      
Standby Costs $ 0bpz_StandbyCosts $ 4,311bpz_StandbyCosts $ 5,340bpz_StandbyCosts