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Note 3 - Available-for-sale Securities - Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale securities, amortized cost | $ 108,551 | $ 49,960
Available-for-sale securities, gross unrealized gains | 500 | 491
Available-for-sale securities, gross unrealized losses | (439) | (1,189)
Available-for-sale securities | 108,612 | 49,262
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, amortized cost | 74,303 | 16,719
Available-for-sale securities, gross unrealized gains | 74 | 131
Available-for-sale securities, gross unrealized losses | (373) | (17)
Available-for-sale securities | 74,004 | 16,833
Corporate Debt Securities [Member] |  |
Available-for-sale securities, amortized cost | 18,253 | 18,014
Available-for-sale securities, gross unrealized gains | 339 | 260
Available-for-sale securities, gross unrealized losses | 0 | (984)
Available-for-sale securities | 18,592 | 17,290
Subordinated Notes [Member] |  |
Available-for-sale securities, amortized cost | 4,609 | 9,036
Available-for-sale securities, gross unrealized gains | 69 | 97
Available-for-sale securities, gross unrealized losses | (4) | (128)
Available-for-sale securities | 4,674 | 9,005
SBA Loan Pools [Member] |  |
Available-for-sale securities, amortized cost | 10,823 | 5,627
Available-for-sale securities, gross unrealized gains | 17 | 0
Available-for-sale securities, gross unrealized losses | (61) | (60)
Available-for-sale securities | 10,779 | 5,567
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities, amortized cost | 563 | 564
Available-for-sale securities, gross unrealized gains | 1 | 3
Available-for-sale securities, gross unrealized losses | (1) | 0
Available-for-sale securities | $ 563 | $ 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=123581744&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=123581744&loc=d3e27161-111563 + Details
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