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Note 13 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 1.8 | $ 1.7 | $ 1.6
Defined Contribution Plan, Cost | $ 6.3 | $ 4.3 | $ 4.4

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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