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Note 17 - Balance Sheet Offsetting (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Gross Amounts Not Offset in the |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Balance Sheet |
|  | Gross Amounts Recognized |  |  | Gross Amounts Offset in the Balance Sheet |  |  | Net Amounts Presented in the Balance Sheet |  |  | Financial Instruments |  |  | Collateral Posted |  |  | Net Amount |
|  | (In thousands) |
September 30, 2019 |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | 1,697 |  |  | $ | — |  |  | $ | 1,697 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,697 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | 17,734 |  |  | $ | — |  |  | $ | 17,734 |  |  | $ | — |  |  | $ | (22,198 | ) |  | $ | (4,464 | )
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | 7,810 |  |  | $ | — |  |  | $ | 7,810 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,810 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | 1,543 |  |  | $ | — |  |  | $ | 1,543 |  |  | $ | — |  |  | $ | (1,543 | ) |  | $ | — |

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration