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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Equity Securities, FV-NI, Unrealized Gain (Loss), Total |  | $ 391,000 | $ (4,580,000) |
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 |  |  |
Accounting Standards Update 2016-02 [Member] | Minimum [Member] | Scenario, Forecast [Member] |  |  |  |
Operating Lease, Liability, Total | 30,000,000 |  |  |
Accounting Standards Update 2016-02 [Member] | Maximum [Member] | Scenario, Forecast [Member] |  |  |  |
Operating Lease, Liability, Total | $ 40,000,000 |  |  |

X
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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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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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