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Note 6 - Securities - Available-for-sale Securities With Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | $ 8,726 | $ 53,233
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (102) | (336)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 0 | 53,990
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | 0 | (626)
Available-for-sale securities with unrealized loss positions, fair value | 8,726 | 107,223
Available-for-sale securities, with unrealized loss positions, unrealized losses | (102) | (962)
Obligations of States and Political Subdivisions Tax Exempt [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | 2,968 | 6,429
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (36) | (38)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 0 | 0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | 0 | 0
Available-for-sale securities with unrealized loss positions, fair value | 2,968 | 6,429
Available-for-sale securities, with unrealized loss positions, unrealized losses | (36) | (38)
Obligations of States and Political Subdivisions Taxable [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | 1,270 | 5,624
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (38) | (68)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 0 | 161
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | 0 | (2)
Available-for-sale securities with unrealized loss positions, fair value | 1,270 | 5,785
Available-for-sale securities, with unrealized loss positions, unrealized losses | (38) | (70)
Residential Collateralized Mortgage Obligations [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | 875 | 31,409
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (9) | (195)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 0 | 30,535
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | 0 | (415)
Available-for-sale securities with unrealized loss positions, fair value | 875 | 61,944
Available-for-sale securities, with unrealized loss positions, unrealized losses | (9) | (610)
Residential Pass-Through Securities [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value |  | 9,771
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses |  | (35)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value |  | 14,787
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses |  | (102)
Available-for-sale securities with unrealized loss positions, fair value |  | 24,558
Available-for-sale securities, with unrealized loss positions, unrealized losses |  | (137)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | 3,613 | 0
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (19) | 0
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 0 | 8,507
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | 0 | (107)
Available-for-sale securities with unrealized loss positions, fair value | 3,613 | 8,507
Available-for-sale securities, with unrealized loss positions, unrealized losses | $ (19) | $ (107)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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