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Note 13 - Stockholders' Equity - Components of Accumulated Other Comprehensive Loss and Changes During the Year (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Beginning balance, net of tax | $ (8,362) | $ (5,562) | $ (2,907)
Other comprehensive income (loss) before reclassifications, net of tax | (1,055) | (2,217) | (3,203)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 431 | (583) | 548
Total other comprehensive income (loss), net of tax | (624) | (2,800) | (2,655)
Ending balance, net of tax | (8,986) | (8,362) | (5,562)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |
Beginning balance, net of tax | (3,859) | (521) | 3,392
Other comprehensive income (loss) before reclassifications, net of tax | (1,771) | (2,452) | (3,818)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 108 | (886) | (95)
Total other comprehensive income (loss), net of tax | (1,663) | (3,338) | (3,913)
Ending balance, net of tax | (5,522) | (3,859) | (521)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Beginning balance, net of tax |  |  |
Other comprehensive income (loss) before reclassifications, net of tax | 231 |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  |  |
Total other comprehensive income (loss), net of tax | 231 |  |
Ending balance, net of tax | 231 |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Beginning balance, net of tax | (4,503) | (5,041) | (6,299)
Other comprehensive income (loss) before reclassifications, net of tax | 485 | 235 | 615
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 323 | 303 | 643
Total other comprehensive income (loss), net of tax | 808 | 538 | 1,258
Ending balance, net of tax | $ (3,695) | $ (4,503) | $ (5,041)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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