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Note 9 - 401(k) Profit Sharing, Deferred Compensation and Long-term Incentive Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Minimum [Member] |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 1 year |  |
Maximum [Member] |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 7 years |  |
Other Noncurrent Liabilities [Member] |  |  |
Deferred Compensation Liability, Classified, Noncurrent | $ 19.7 | $ 14.2 |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 5.3 | $ 3.2 | $ 2.1

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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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