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Note 3 - Available-for-sale Securities - Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale securities, amortized cost | $ 49,960 | $ 48,860
Available-for-sale securities, gross unrealized gains | 491 | 405
Available-for-sale securities, gross unrealized losses | (1,189) | (948)
Available-for-sale securities | 49,262 | 48,317
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, amortized cost | 16,719 | 16,663
Available-for-sale securities, gross unrealized gains | 131 | 90
Available-for-sale securities, gross unrealized losses | (17) | (68)
Available-for-sale securities | 16,833 | 16,685
Corporate Debt Securities [Member] |  |
Available-for-sale securities, amortized cost | 18,014 | 18,018
Available-for-sale securities, gross unrealized gains | 260 | 133
Available-for-sale securities, gross unrealized losses | (984) | (838)
Available-for-sale securities | 17,290 | 17,313
Subordinated Notes [Member] |  |
Available-for-sale securities, amortized cost | 9,036 | 9,022
Available-for-sale securities, gross unrealized gains | 97 | 182
Available-for-sale securities, gross unrealized losses | (128) |
Available-for-sale securities | 9,005 | 9,204
SBA Loan Pools [Member] |  |
Available-for-sale securities, amortized cost | 5,627 | 5,157
Available-for-sale securities, gross unrealized gains |  |
Available-for-sale securities, gross unrealized losses | (60) | (42)
Available-for-sale securities | 5,567 | $ 5,115
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities, amortized cost | 564 |
Available-for-sale securities, gross unrealized gains | 3 |
Available-for-sale securities, gross unrealized losses |  |
Available-for-sale securities | $ 567 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (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=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (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 (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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