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Note 4 - Securities - Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale securities, cost basis | $ 283,191 | $ 271,833
Available for sale securities, gross unrealized gains | 12,906 | 6,653
Available for sale securities, gross unrealized losses | (1,378) | (1,267)
Total securities available-for-sale | 294,719 | 277,219
Money Market Funds [Member] |  |
Available for sale securities, cost basis | 21,457 | 9,670
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | 0 | 0
Total securities available-for-sale | 21,457 | 9,670
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Available for sale securities, cost basis | 129,789 | 149,339
Available for sale securities, gross unrealized gains | 4,284 | 1,745
Available for sale securities, gross unrealized losses | 0 | (96)
Total securities available-for-sale | 134,073 | 150,988
US Treasury 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 |  | 0
Total securities available-for-sale |  | 13,058
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, cost basis | 129,754 | 97,628
Available for sale securities, gross unrealized gains | 8,622 | 4,844
Available for sale securities, gross unrealized losses | (2) | (45)
Total securities available-for-sale | 138,374 | 102,427
Collateralized Debt Obligations [Member] |  |
Available for sale securities, cost basis | 2,191 | 2,202
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (1,376) | (1,126)
Total securities available-for-sale | $ 815 | $ 1,076

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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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