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Note 9 - Pledged Collateral Related to Securities Sold Under Repurchase Agreements - Pledged Collateral at Estimated Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Maturity Overnight [Member] |  |
Securities sold under agreements to repurchase | $ 53,156 |
Maturity Overnight [Member] | US Treasury and Government [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member] |  |
Securities sold under agreements to repurchase | 2,060 |
Maturity Overnight [Member] | US Government Agencies Debt Securities [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member] |  |
Securities sold under agreements to repurchase | 36,445 |
Maturity Overnight [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member] |  |
Securities sold under agreements to repurchase | $ 14,651 |
Maturity Greater than 90 Days [Member] |  |
Securities sold under agreements to repurchase |  | $ 55,751
Maturity Greater than 90 Days [Member] | US Treasury and Government [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member] |  |
Securities sold under agreements to repurchase |  | 2,069
Maturity Greater than 90 Days [Member] | US Government Agencies Debt Securities [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member] |  |
Securities sold under agreements to repurchase |  | 39,362
Maturity Greater than 90 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member] |  |
Securities sold under agreements to repurchase |  | $ 14,320

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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://www.xbrl.org/2003/role/disclosureRef -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://www.xbrl.org/2003/role/exampleRef -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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