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Note 4 - Investment and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Less than Twelve Months, Fair Value | $ 22,519 | $ 7,264
Less than Twelve Months, Gross Unrealized Losses | (295) | (81)
Twelve Months or Greater, Fair Value | 27,415 | 15,554
Twelve Months or Greater, Gross Unrealized Losses | (754) | (315)
Total, Fair Value | 49,934 | 22,818
Total, Gross Unrealized Losses | (1,049) | (396)
US Government Agencies Debt Securities [Member] |  |
Less than Twelve Months, Fair Value |  | 557
Less than Twelve Months, Gross Unrealized Losses |  | (4)
Twelve Months or Greater, Fair Value | 4,105 | 4,036
Twelve Months or Greater, Gross Unrealized Losses | (61) | (67)
Total, Fair Value | 4,105 | 4,593
Total, Gross Unrealized Losses | (61) | (71)
Nontaxable Municipal Bonds [Member] |  |
Less than Twelve Months, Fair Value | 20,451 | 1,009
Less than Twelve Months, Gross Unrealized Losses | (286) | (6)
Twelve Months or Greater, Fair Value | 11,053 | 2,784
Twelve Months or Greater, Gross Unrealized Losses | (187) | (32)
Total, Fair Value | 31,504 | 3,793
Total, Gross Unrealized Losses | (473) | (38)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than Twelve Months, Fair Value | 2,068 | 5,698
Less than Twelve Months, Gross Unrealized Losses | (9) | (71)
Twelve Months or Greater, Fair Value | 12,257 | 8,734
Twelve Months or Greater, Gross Unrealized Losses | (506) | (216)
Total, Fair Value | 14,325 | 14,432
Total, Gross Unrealized Losses | $ (515) | $ (287)

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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