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Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets [Line Items]
Ending balance	$ (17,326)	$ (8,461)
Currency Translation Adjustments [Member]
Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets [Line Items]
Ending balance	(4,338)	(1,062)	319	(118)
Current period credit (charge)	(3,276)	(1,381)	437
Pension And OPEB Adjustments [Member]
Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets [Line Items]
Ending balance	(12,988)	(7,399)	(16,601)	(15,926)
Reclassifications adjustments	483	5,526	4,729
Current period credit (charge)	(9,294)	8,925	(5,716)
Income tax benefit (charge)	3,222	(5,249)	312
Accumulated Other Comprehensive Income (Loss) [Member]
Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets [Line Items]
Ending balance	(17,326)	(8,461)	(16,282)	(16,044)
Reclassifications adjustments	483
Current period credit (charge)	(12,087)	13,070	(550)
Income tax benefit (charge)	$ 3,222	$ (5,249)	$ 312

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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