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Note 7 - Investment and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Less than Twelve Months, Fair Value | $ 32,647 | $ 7,264
Less than Twelve Months, Gross Unrealized Losses | (793) | (81)
Twelve Months or Greater, Fair Value | 15,049 | 15,554
Twelve Months or Greater, Gross Unrealized Losses | (634) | (315)
Total, Fair Value | 47,696 | 22,818
Total, Gross Unrealized Losses | (1,427) | (396)
US Government Agencies Debt Securities [Member] |  |
Less than Twelve Months, Fair Value | 495 | 557
Less than Twelve Months, Gross Unrealized Losses | (13) | (4)
Twelve Months or Greater, Fair Value | 3,816 | 4,036
Twelve Months or Greater, Gross Unrealized Losses | (94) | (67)
Total, Fair Value | 4,311 | 4,593
Total, Gross Unrealized Losses | (107) | (71)
Nontaxable Municipal Bonds [Member] |  |
Less than Twelve Months, Fair Value | 27,247 | 1,009
Less than Twelve Months, Gross Unrealized Losses | (571) | (6)
Twelve Months or Greater, Fair Value | 2,713 | 2,784
Twelve Months or Greater, Gross Unrealized Losses | (99) | (32)
Total, Fair Value | 29,960 | 3,793
Total, Gross Unrealized Losses | (670) | (38)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than Twelve Months, Fair Value | 4,905 | 5,698
Less than Twelve Months, Gross Unrealized Losses | (209) | (71)
Twelve Months or Greater, Fair Value | 8,520 | 8,734
Twelve Months or Greater, Gross Unrealized Losses | (441) | (216)
Total, Fair Value | 13,425 | 14,432
Total, Gross Unrealized Losses | $ (650) | $ (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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