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Note 12 - Fair Value Measurements - Balances of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair value, available for sale securities	$ 266,600	$ 140,225	[1]
Fair Value, Recurring [Member]
Fair value, available for sale securities	266,600	140,225
Derivatives - cash flow hedges	990	431
Assets, Fair Value	267,590	140,656
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
Derivatives - cash flow hedges	0	0
Assets, Fair Value	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	266,600	140,225
Derivatives - cash flow hedges	990	431
Assets, Fair Value	267,590	140,656
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	0	0
Derivatives - cash flow hedges	0	0
Assets, Fair Value	0	0
US Treasury Securities [Member]
Fair value, available for sale securities	19,976
US Treasury Securities [Member] | Fair Value, Recurring [Member]
Fair value, available for sale securities	19,976
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	19,976
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	0
US Agency and Mortgage-backed Securities [Member]
Fair value, available for sale securities	173,261	101,598
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member]
Fair value, available for sale securities	173,261	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	0	0
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	173,261	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	0	0
Municipal Bonds [Member] | Fair Value, Recurring [Member]
Fair value, available for sale securities	71,327	38,627
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	71,327	38,627
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	0	$ 0
Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair value, available for sale securities	2,036
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	2,036
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	$ 0
[1] Derived from audited consolidated financial statements.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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