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Note 4 - Investment and Equity Securities - Amortized Cost and Fair Values of Securities Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost | $ 98,516 | $ 93,631
Gross unrealized gains | 855 | 2,048
Gross unrealized losses | (1,049) | (396)
Investment securities available for sale, at fair value | 98,322 | 95,283
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 7,442 | 8,664
Gross unrealized gains | 90 | 126
Gross unrealized losses | (61) | (71)
Investment securities available for sale, at fair value | 7,471 | 8,719
Taxable Municipal Bonds [Member] |  |
Amortized cost | 502 | 504
Gross unrealized gains | 10 | 8
Gross unrealized losses |  |
Investment securities available for sale, at fair value | 512 | 512
Nontaxable Municipal Bonds [Member] |  |
Amortized cost | 72,387 | 65,408
Gross unrealized gains | 667 | 1,547
Gross unrealized losses | (473) | (38)
Investment securities available for sale, at fair value | 72,581 | 66,917
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Amortized cost | 18,185 | 18,640
Gross unrealized gains | 88 | 157
Gross unrealized losses | (515) | (287)
Investment securities available for sale, at fair value | $ 17,758 | 18,510
Debt Securities [Member] |  |
Amortized cost |  | 93,216
Gross unrealized gains |  | 1,838
Gross unrealized losses |  | (396)
Investment securities available for sale, at fair value |  | 94,658
Equity Securities [Member] |  |
Amortized cost |  | 415
Gross unrealized gains |  | 210
Gross unrealized losses |  |
Investment securities available for sale, at fair value |  | $ 625

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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Balance Type: | debit
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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