Note 13 - Fair Value - Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - Measurement Input, Discount Rate [Member] - Valuation, Market Approach [Member]		Mar. 31, 2022	Dec. 31, 2021
Minimum [Member]
Discount range, impaired loans	[1],[2]	0	0
Discount range, non-covered OREO	[1],[2]	0	0
Maximum [Member]
Discount range, impaired loans	[1],[2]	0.11	0.11
Discount range, non-covered OREO	[1],[2]	0.87	0.87
Weighted Average [Member]
Discount range, impaired loans	[1],[2]	0.06	0.06
Discount range, non-covered OREO	[1],[2]	0.32	0.32

[1] Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.

[2] Fair value is generally based on appraisals of the underlying collateral.