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Note 8 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Contribution Plan, Cost Recognized | $ 15.6 | $ 14.7 | $ 11.6
Deferred Compensation Liability, Current and Noncurrent | 14.9 | 13.6 |
Other Current Assets [Member] | Equity Securities [Member] |  |  |
Trading Securities | $ 14.9 | $ 13.6 |

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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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