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Note 3 - Securities - Available for Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available for sale securities, cost basis | $ 271,833 | $ 245,308
Available for sale securities, gross unrealized gains | 6,653 | 1,235
Available for sale securities, gross unrealized losses | (1,267) | (4,775)
Securities available-for-sale | 277,219 | 241,768
Money Market Funds [Member] |  |
Available for sale securities, cost basis | 9,670 | 2,480
Available for sale securities, gross unrealized gains |  |
Available for sale securities, gross unrealized losses |  |
Securities available-for-sale | 9,670 | 2,480
US Government-sponsored Enterprises Debt Securities [Member] |  |
Available for sale securities, cost basis | 12,994 |
Available for sale securities, gross unrealized gains | 64 |
Available for sale securities, gross unrealized losses |  |
Securities available-for-sale | 13,058 |
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Available for sale securities, cost basis | 149,339 | 137,834
Available for sale securities, gross unrealized gains | 1,745 | 135
Available for sale securities, gross unrealized losses | (96) | (2,688)
Securities available-for-sale | 150,988 | 135,281
US Treasury Securities [Member] |  |
Available for sale securities, cost basis |  | 7,997
Available for sale securities, gross unrealized gains |  | 28
Available for sale securities, gross unrealized losses |  | (131)
Securities available-for-sale |  | 7,894
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, cost basis | 97,628 | 93,516
Available for sale securities, gross unrealized gains | 4,844 | 1,072
Available for sale securities, gross unrealized losses | (45) | (524)
Securities available-for-sale | 102,427 | 94,064
Collateralized Debt Obligations [Member] |  |
Available for sale securities, cost basis | 2,202 | 3,481
Available for sale securities, gross unrealized gains |  |
Available for sale securities, gross unrealized losses | (1,126) | (1,432)
Securities available-for-sale | $ 1,076 | $ 2,049

X
- 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=118939692&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=118939692&loc=d3e27161-111563 + Details
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