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Note 13 - Derivative Instruments (Details Textual) gal in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) $ / item gal | Dec. 31, 2016 USD ($) $ / item | Dec. 31, 2015 USD ($) | Aug. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 4.1 | $ 16.7 | $ 15.3 |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | 0.8 | $ 3.6 |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 0.6 |  |  |
Maximum [Member] |  |  |  |
Underlying, Derivative Volume | $ / item | 1.97 | 1.66 |  |
Minimum [Member] |  |  |  |
Underlying, Derivative Volume | $ / item | 1.33 | 0.83 |  |
Interest Rate Swap [Member] |  |  |  |
Derivative, Notional Amount |  |  |  | $ 28.0
Derivative, Fixed Interest Rate |  |  |  | 4.20%
Derivative Instruments in Hedges, Liabilities, at Fair Value | $ 0.4 | $ 0.7 |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | 0.2 |  |  |
Interest Rate Swap [Member] | Interest Expense [Member] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 0.4 | $ 0.6 |  |
Fuel Hedge Contracts for 2018 Requirements [Member] |  |  |  |
Derivative, Nonmonetary Notional Amount, Volume | gal | 7.6 |  |  |
Percent of Projected Fuel Requirements | 16.10% |  |  |
Additional Fuel Expense No Longer Deemed to be Effective [Member] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  | 1.4 |
Hedge Contracts, Ineffectiveness [Member] |  |  |  |
Derivative Reduction of Fuel Expense |  |  | $ 1.4 |

X
- Definition Represents the amount of the reduction of fuel expense related to the fuel hedge contracts. + References No definition available. + Details
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X
- Definition Percentage of estimated annual fuel requirements hedged for the remainder of the period. + References No definition available. + 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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X
- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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X
- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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X
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X
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