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Note 12 - Fair Value Measurements - Balances of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value, available for sale securities | $ 159,742 | $ 140,225 | [1]
Fair Value, Recurring [Member] |  |  |
Fair value, available for sale securities | 159,742 | 140,225 |
Derivatives - cash flow hedges | 1,365 | 431 |
Assets, Fair Value | 161,107 | 140,656 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, available for sale securities |  |  |
Derivatives - cash flow hedges |  |  |
Assets, Fair Value |  |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, available for sale securities | 159,742 | 140,225 |
Derivatives - cash flow hedges | 1,365 | 431 |
Assets, Fair Value | 161,107 | 140,656 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value, available for sale securities |  |  |
Derivatives - cash flow hedges |  |  |
Assets, Fair Value |  |  |
US Agency and Mortgage-backed Securities [Member] |  |  |
Fair value, available for sale securities | 109,339 | 101,598 |
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] |  |  |
Fair value, available for sale securities | 109,339 | 101,598 |
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, available for sale securities |  |  |
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, available for sale securities | 109,339 | 101,598 |
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value, available for sale securities |  |  |
Municipal Bonds [Member] |  |  |
Fair value, available for sale securities | 50,403 | 38,627 |
Municipal Bonds [Member] | Fair Value, Recurring [Member] |  |  |
Fair value, available for sale securities | 50,403 | 38,627 |
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, available for sale securities |  |  |
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, available for sale securities | 50,403 | 38,627 |
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value, available for sale securities |  |  |
[1] | Derived from audited consolidated financial statements.

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