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Note 7 - Investment and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Less than Twelve Months, Fair Value | $ 51,663 | $ 5,733
Less than Twelve Months, Gross Unrealized Losses | (3,824) | (27)
Twelve Months or Greater, Fair Value | 2,539 | 8,223
Twelve Months or Greater, Gross Unrealized Losses | (14) | (107)
Total, Fair Value | 54,202 | 13,956
Total, Gross Unrealized Losses | (3,838) | (134)
Nontaxable Municipal Bonds [Member] |  |
Less than Twelve Months, Fair Value | 51,663 | 4,324
Less than Twelve Months, Gross Unrealized Losses | (3,824) | (25)
Twelve Months or Greater, Fair Value |  |
Twelve Months or Greater, Gross Unrealized Losses |  |
Total, Fair Value | 51,663 | 4,324
Total, Gross Unrealized Losses | (3,824) | (25)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than Twelve Months, Fair Value |  | 1,409
Less than Twelve Months, Gross Unrealized Losses |  | (2)
Twelve Months or Greater, Fair Value | 2,539 | 8,223
Twelve Months or Greater, Gross Unrealized Losses | (14) | (107)
Total, Fair Value | 2,539 | 9,632
Total, Gross Unrealized Losses | $ (14) | $ (109)

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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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