Note 3 - Loans and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)
Number of Contracts	3	8
Pre- Modification Recorded Principal Balance	$ 308,000	$ 7,094,000
Post- Modification Recorded Principal Balance	$ 308,000	$ 7,093,000
Commercial Portfolio Segment [Member]
Number of Contracts	1	3
Pre- Modification Recorded Principal Balance	$ 19,000	$ 6,593,000
Post- Modification Recorded Principal Balance	$ 19,000	$ 6,593,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Number of Contracts	1	3
Pre- Modification Recorded Principal Balance	$ 19,000	$ 6,593,000
Post- Modification Recorded Principal Balance	$ 19,000	$ 6,593,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Number of Contracts	0	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Number of Contracts	0	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Number of Contracts	0	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Number of Contracts	0	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0
Retail Portfolio Segment [Member]
Number of Contracts	2	5
Pre- Modification Recorded Principal Balance	$ 289,000	$ 501,000
Post- Modification Recorded Principal Balance	$ 289,000	$ 500,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Number of Contracts	2	5
Pre- Modification Recorded Principal Balance	$ 289,000	$ 501,000
Post- Modification Recorded Principal Balance	$ 289,000	$ 500,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]
Number of Contracts	0	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0