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Note 2 - Derivative Instruments and Hedging Activities (Details) - Outstanding Commodity Forward Contracts (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended | 6 Months Ended
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Jun. 30, 2014 Commodity Forward Contract Two [Member] | Jun. 30, 2014 Commodity Forward Contract Three [Member] | Jun. 30, 2013 Commodity Forward Contract One [Member] | Dec. 31, 2013 Commodity Forward Contract One [Member] | Jun. 30, 2013 Commodity Forward Contract Four [Member] | Jun. 30, 2013 Commodity Forward Contract Five [Member] | Jun. 30, 2013 Commodity Forward Contract Six [Member] | Jun. 30, 2013 Commodity Forward Contract Seven [Member]
Note 2 - Derivative Instruments and Hedging Activities (Details) - Outstanding Commodity Forward Contracts [Line Items] |  |  |  |  |  |  |  |
Trade date | Jan. 31, 2014 | Mar. 11, 2014 | Jun. 21, 2013 | Jun. 21, 2013 | Oct. 29, 2012 | Feb. 26, 2013 | Mar. 01, 2013 | Apr. 15, 2013
Effective date | Feb. 01, 2014 | Apr. 01, 2014 | Oct. 01, 2013 | Oct. 01, 2013 | Jan. 01, 2013 | Mar. 01, 2013 | Mar. 01, 2013 | May 01, 2013
Notional amount | $ 3,879 | $ 3,014 | $ 2,169 | $ 2,169 | $ 3,472 | $ 2,677 | $ 2,636 | $ 4,033
Termination date | Dec. 31, 2014 | Dec. 31, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2013

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- Definition Date the derivative contract become effective, in CCYY-MM-DD format. + References No definition available. + Details
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- Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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