Note 17 - Shareholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (AOCI) by Component (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amortization of prior service (cost) credit		$ 6,000	$ 6,000	$ 6,000
	[1]		(1,000)	(1,000)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of net actuarial loss	[1],[2]	(62,000)	(168,000)	(29,000)
Amortization of prior service (cost) credit	[1],[2]	(1,000)	1,000
	[1]	23,000	62,000	11,000
	[1]	(40,000)	(105,000)	(18,000)
	[1]
	[1]	(36,000)	6,000	7,000
Realized (losses) gains on designated hedges	[1]	12,000	(6,000)	(4,000)
	[1]	(2,000)
	[1]	(22,000)	20,000	6,000
Total reclassifications for the period	[1]	(62,000)	(86,000)	(13,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Income [Member]
	[1]	(63,000)	(167,000)	(29,000)
Realized gains (losses) on investments	[1]		(1,000)	(1,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Sales [Member]
Realized (losses) gains on designated hedges	[1]	4,000	20,000	3,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cost of Sales [Member]
Realized (losses) gains on designated hedges	[1]	$ (34,000)	$ 26,000	$ 10,000

[1] Amounts in parentheses indicate debits to the statement of income.

[2] These accumulated other comprehensive income components are included in net periodic pension cost. See Note 13 (Employee Retirement Plans) to the Consolidated Financial Statements for additional details.