Note 9 - Derivatives and Hedging Activities (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Noninterest Expense, Total	$ 26,192,000	$ 23,216,000	$ 51,309,000	$ 46,156,000
Interest Rate Swap [Member]
Noninterest Expense, Total			100,000		$ 100,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total	2,700,000		2,700,000		1,000,000.0
Derivative, Collateral, Right to Reclaim Cash	2,300,000		2,300,000		1,100,000
Derivative, Notional Amount	$ 118,326,000		$ 118,326,000		$ 33,731,000