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Note 1 - Summary of Significant Accounting Policies and Other Information (Details Textual) - Accounting Standards Update 2016-01 [Member] $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Cumulative Effect on Retained Earnings, Net of Tax, Total | $ 9.8
Equity Securities, FV-NI, Unrealized Gain (Loss), Total | $ 1.9

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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