Note 7 - Loans and the Allowance for Loan Losses - Loan Receivables on Nonaccrual Status (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans receivable on nonaccrual status	$ 12,868	$ 9,063
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Loans receivable on nonaccrual status	1,341	924
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans receivable on nonaccrual status	76	367
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Loans receivable on nonaccrual status	2,614	3,119
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member]
Loans receivable on nonaccrual status	3,601	2,603
Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Loans receivable on nonaccrual status	0	0
Commercial Portfolio Segment [Member]
Loans receivable on nonaccrual status	4,947	1,753
Consumer Portfolio Segment [Member]
Loans receivable on nonaccrual status	$ 289	$ 297