Note 7 - Loans Receivable and Allowance for Credit Losses (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jan. 01, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans			$ 289,000	$ 546,451
Financing Receivable, Allowance for Credit Loss, Ending Balance	$ 25,255,000	$ 17,218,000	25,255,000	$ 17,218,000	$ 18,964,000	$ 20,997,000	$ 23,156,000		$ 16,110,000	$ 12,975,000
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	99,000		7,000
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	$ 604,000		$ 604,000
Financing Receivable, Number of Payment Deferrals	0		0		0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0		0		0
Number of Mortgage Loans in Process of Foreclosure			0		1
Real Estate Acquired Through Foreclosure	$ 876,000		$ 876,000		$ 360,000
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss, Ending Balance	$ 9,569,000	$ 4,552,000	$ 9,569,000	$ 4,552,000	4,922,000	$ 6,957,000	$ 5,620,000		$ 4,270,000	$ 3,025,000
Real Estate Acquired Through Foreclosure	$ 0		$ 0		$ 0
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss, Ending Balance								$ 4,200,000