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Note 16 - Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Highest Average Compensation Period | 5 years |
Defined Benefit Plan Maximum Period Allocated for Calculating Average Compensation | 10 years |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax | $ (15,675,000) |
Defined Benefit Plan, Future Amortization of Gain (Loss) | (705,000) |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax | 664,000 | $ 694,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  | 3.00%
Defined Contribution Plan, Cost Recognized | $ 2,502,000 | $ 4,058,000
Defined Contribution Plan, Number of Employees Covered | 368 | 423
Defined Contribution Plan [Member] |  |
Defined Contribution Plan, Cost Recognized | $ 668,000 | $ 930,000
Non US Employees Defined Benefit Plan [Member] |  |
Defined Benefit Plan, Administration Expenses | $ 11,000 | $ 30,000
Equity Securities [Member] |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 0.00% |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 55.00% |
Fixed Income Securities [Member] |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 35.00% |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 100.00% |
Non Traditional Securities [Member] |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 0.00% |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 10.00% |

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- Definition Represents defined benefit plan maximum period allocated for calculating average compensation. + References No definition available. + Details
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- Definition Amount of plan administration expenses deducted from total plan assets. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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