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Note 24 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale Securities | $ 538,108 | $ 487,869
Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale Securities | 1,718 | 219
Corporate Debt Securities [Member] |  |
Available-for-sale Securities | 9,579 | $ 14,938
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale Securities | $ 1,500 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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