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Note 14 - Benefit Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Employer Contribution under Medical and Dental Plan | $ 15,019 | $ 14,352 | $ 11,701
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 50.00% |  |
Defined Contribution Plan Percentage of Eligible Compensation | 6.00% |  |
Defined Contribution Plan, Cost Recognized | $ 3,400 | 3,000 | 3,400
Defined Benefit Plan, Amortization of Gains (Losses) | (941) | $ (1,228) | $ (106)
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year | $ 883 |  |
Defined Benefit Plan, Target Plan Asset Allocations | 100.00% |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | $ 568 |  |
Equity and Real Estate [Member] | Minimum [Member] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 65.00% |  |
Equity and Real Estate [Member] | Maximum [Member] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 85.00% |  |

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- Definition Percentage of eligible compensation of employees under defined contribution plan. + References No definition available. + Details
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- Definition Contribution made under medical and dental plan made by the employer. + References No definition available. + Details
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X
- Definition The amount of gains or losses recognized in net periodic benefit cost. + 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 (h)(4) -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) 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, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition Target allocation 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 Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + 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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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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