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Note 11 - Other Comprehensive Income ("OCI") - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, tax	$ (38)	$ (510)
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax	99	$ (814)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	62
Commodity Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax	(144)
Commodity Contract [Member] | Fuel Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, before tax	(199)
Commodity Contract [Member] | Income Tax Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, tax	55
Interest Rate Cap [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, net of tax	45
Interest Rate Cap [Member] | Income Tax Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive income (loss), reclassification adjustment from AOCI on derivatives, tax	$ (17)

X

- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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- Definition

Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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