Note 11 - Recent Accounting Pronouncements (Details Textual) $ in Millions	Sep. 30, 2022 USD ($)
Commercial Portfolio Segment [Member]
Loans Receivable with Variable Rates of Interest	$ 1.7
Number of Tax-exempt Loans Tied to LIBOR Reference Rate	2
National Syndicated Credits [Member]
Number of Purchased Participation Loans Tied to LIBOR Reference Rate	2
Loans Receivable with Variable Rates of Interest	$ 6.8
Financial Asset Acquired and No Credit Deterioration [Member]
Number of Purchased Participation Loans Tied to LIBOR Reference Rate	11
Loans Receivable with Variable Rates of Interest	$ 47.3