Note 3 - Fair Value Measurement Fair Value of Assets measured Recurring and Nonrecurring basis (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 81.2	$ 79.6
asset impairment charge for aicraft and related inventory - Q400 and E190	27.7
assets, fair value disclosure - E140	0
asset impairment charge for aircraft and related inventory - E140	19.9
assets, fair value disclosure - Q400	49.7
asset impairment charge for aircraft and related inventory - Q400	13.3
assets, fair value disclosure - E190	101.6
asset impairment charge for aircraft and related inventory - E190	14.4
asset impairment charge for aircraft and related inventory	47.6	12.0
Assets, Fair Value Disclosure		152.5
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	81.2	79.6
Assets, Fair Value Disclosure		$ 152.5