Note 11 - Capital Ratios and Regulatory Minimum Requirements (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
The Company [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital	$ 169,099	$ 167,711
Tier 1 capital	160,249	158,753
Common equity tier 1 capital	160,249	158,753
Tier 1 leverage capital	$ 160,249	$ 158,753
Capital to risk-weighted assets	0.1287	0.1309
Tier 1 capital to risk-weighted assets	0.1219	0.1239
Common equity tier 1 capital to risk-weighted assets	12.19%	12.39%
Tier 1 leverage capital to average assets	0.0901	0.0892
Capital required for capital adequacy	$ 105,143	$ 102,513
Tier 1 capital required for capital adequacy	78,858	76,885
Common equity tier 1 capital required for capital adequacy	59,143	57,664
Tier 1 leverage capital required for capital adequacy	$ 71,143	$ 71,185
Capital required for capital adequacy to risk-weighted assets	0.0800	0.0800
Tier 1 capital required for capital adequacy to risk-weighted assets	0.0600	0.0600
Common equity tier 1 capital required for capital adequacy to risk-weighted assets	4.50%	4.50%
Tier 1 leverage capital required for capital adequacy to average assets	0.04	0.0400
Capital required to be well capitalized	$ 131,429	$ 128,142
Tier 1 capital required to be well capitalized	$ 78,858	$ 76,885
Capital required to be well capitalized to risk-weighted assets	0.1000	0.1000
Tier 1 capital required to be well capitalized to risk-weighted assets	0.0600	0.0600
Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital	$ 155,045	$ 154,062
Tier 1 capital	146,195	145,104
Common equity tier 1 capital	146,195	145,104
Tier 1 leverage capital	$ 146,195	$ 145,104
Capital to risk-weighted assets	0.1198	0.1220
Tier 1 capital to risk-weighted assets	0.113	0.1149
Common equity tier 1 capital to risk-weighted assets	11.30%	11.49%
Tier 1 leverage capital to average assets	0.0828	0.0818
Capital required for capital adequacy	$ 103,510	$ 101,032
Tier 1 capital required for capital adequacy	77,633	75,774
Common equity tier 1 capital required for capital adequacy	58,225	56,830
Tier 1 leverage capital required for capital adequacy	$ 70,590	$ 70,961
Capital required for capital adequacy to risk-weighted assets	0.08	0.0800
Tier 1 capital required for capital adequacy to risk-weighted assets	0.06	0.0600
Common equity tier 1 capital required for capital adequacy to risk-weighted assets	4.50%	4.50%
Tier 1 leverage capital required for capital adequacy to average assets	0.04	0.0400
Capital required to be well capitalized	$ 129,388	$ 126,290
Tier 1 capital required to be well capitalized	103,510	101,032
Common equity tier 1 capital required to be well capitalized	84,102	82,088
Tier 1 leverage capital required to be well capitalized	$ 88,237	$ 88,701
Capital required to be well capitalized to risk-weighted assets	0.10	0.1000
Tier 1 capital required to be well capitalized to risk-weighted assets	0.08	0.0800
Common equity tier 1 capital required to be well capitalized to risk-weighted assets	6.50%	6.50%
Tier 1 leverage capital required to be well capitalized to average assets	0.05	0.0500