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Note 11 - Reclassifications of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Items [Member] | Net Periodic Pension Costs [Member]    
Net periodic pension cost $ (170) $ (86)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Items [Member] | Associated Tax Expense Benefit [Member]    
Associated tax benefit (expense) 63 31
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Items [Member]    
(107) (55)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow Hedges [Member] | Associated Tax Expense Benefit [Member]    
Associated tax benefit (expense) 47 7
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow Hedges [Member] | Gain on Cash Flow Derivative [Member]    
Gain on cash flow derivatives 127 $ 20
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow Hedges [Member] | Hedge Ineffectiveness [Member]    
Gain on cash flow derivatives (1)  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow Hedges [Member]    
79 $ 13
Reclassification out of Accumulated Other Comprehensive Income [Member]    
(28) (42)
Net periodic pension cost (137,413) (169,004)
Associated tax benefit (expense) 2,712 (1,089)
(14,180) (8,912)
Gain on cash flow derivatives $ 138,711 $ 184,635