Note 11 - Accumulated Other Comprehensive Income (Details) - Components of AOCI (Reclassification out of Accumulated Other Comprehensive Income [Member], Commodity Contract [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Gains/(losses) on cash flow hedges
	$ 168
Fuel Expense [Member]
Gains/(losses) on cash flow hedges
Commodity derivative contracts	273
Income Tax Expense [Member]
Gains/(losses) on cash flow hedges
	$ (105)