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Note 7 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Measured on a recurring basis:
Derivative contracts, net	$ 0	$ 0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Measured on a recurring basis:
Derivative contracts, net	(1,488)	(1,750)
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Measured on a recurring basis:
Derivative contracts, net	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Measured on a non-recurring basis:
Equity-method investment	$ 39,871	$ 33,282

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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