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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Equity Securities, FV-NI, Unrealized Gain (Loss), Total |  | $ (1,124,000) |  | $ (4,971,000) |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | $ 515,000 |  |  |  |
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 8,600,000 |  |  |  |

X
- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References No definition available. + Details
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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + 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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