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Note 3 - Debt Securities (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase |  | $ (27,769) | $ (716) | $ (67,919)
Number of Securities in Unrealized Loss Position |  | 17 | 90 |
Percentage of Combined Depreciation of Combined Reported Value of Aggregate Securities Portfolio |  | 0.10% | 0.74% |
Number of Securities in Unrealized Loss Position, Greater than or Equal to One Year |  | 10 |  |
Security Owned and Pledged as Collateral, Fair Value, Total |  | $ 27,870 | $ 38,250 |
Wholesale Repurchase Agreements [Member] |  |  |  |
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase | $ 25,000 |  |  |

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- Definition Number of investment positions that have been in a continuous unrealized loss position for greater than or equal to a year. + References No definition available. + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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