Note 9 - Fair Value of Financial Instruments (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 4,131,000	$ 3,333,000	$ 8,948,000	$ 11,127,000
Servicing Asset, Total	185,000,000.0		185,000,000.0		$ 218,900,000
Interest and Fee Income, Loans Held-for-sale, Mortgages	$ 392,000	123,000	$ 728,000	599,000
SBA Servicing Assets [Member]
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Key Assumptions, Percent	10.00%		10.00%		10.00%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Key Assumptions	20.00%		20.00%		20.00%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Mortgages Held-for-sale, Fair Value Disclosure	$ 0		$ 0		$ 0
Shareholder Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 488,000	$ 567,000	$ 1,500,000	$ 1,600,000