Note 3 - Loans and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)
Number of Contracts	3	5
Pre- Modification Recorded Principal Balance	$ 6,657,000	$ 6,785,000
Post- Modification Recorded Principal Balance	$ 6,657,000	$ 6,785,000
Commercial Portfolio Segment [Member]
Number of Contracts	2	2
Pre- Modification Recorded Principal Balance	$ 6,573,000	$ 6,573,000
Post- Modification Recorded Principal Balance	$ 6,573,000	$ 6,573,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Number of Contracts	2	2
Pre- Modification Recorded Principal Balance	$ 6,573,000	$ 6,573,000
Post- Modification Recorded Principal Balance	$ 6,573,000	$ 6,573,000
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	1	3
Pre- Modification Recorded Principal Balance	$ 84,000	$ 212,000
Post- Modification Recorded Principal Balance	$ 84,000	$ 212,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Number of Contracts	1	3
Pre- Modification Recorded Principal Balance	$ 84,000	$ 212,000
Post- Modification Recorded Principal Balance	$ 84,000	$ 212,000
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