Note 11 - Accumulated Other Comprehensive Income (Details) - Components of AOCI (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Gains/(losses)on cash flow hedges
Commodity derivative contracts	$ 282	$ (594)	$ 1	$ (1,551)
	108	228	0	596
	$ 108		$ 1

The amount of net gains or losses on price risk cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income.

No definition available.

Name:	us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration