Note 11 - Capital Ratios and Regulatory Minimum Requirements (Details) $ in Thousands	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
The Company [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital	$ 154,160	$ 151,501
Tier 1 capital	142,821	140,226
Common equity tier 1 capital	142,821	140,226
Tier 1 leverage capital	$ 142,821	$ 140,226
Capital to risk-weighted assets	0.1344	0.1360
Tier 1 capital to risk-weighted assets	0.1246	0.1259
Common equity tier 1 capital to risk-weighted assets	12.46%	12.59%
Tier 1 leverage capital to average assets	0.0852	0.0839
Capital required for capital adequacy	$ 91,733	$ 89,111
Tier 1 capital required for capital adequacy	68,800	66,833
Common equity tier 1 capital required for capital adequacy	51,600	50,125
Tier 1 leverage capital required for capital adequacy	$ 67,015	$ 66,890
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	0.0400	0.0400
Capital required to be well capitalized	$ 114,666	$ 111,389
Tier 1 capital required to be well capitalized	$ 68,800	$ 66,833
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	$ 140,997	$ 138,419
Tier 1 capital	129,668	127,144
Common equity tier 1 capital	129,668	127,144
Tier 1 leverage capital	$ 129,668	$ 127,144
Capital to risk-weighted assets	0.1271	0.1285
Tier 1 capital to risk-weighted assets	0.1169	0.1181
Common equity tier 1 capital to risk-weighted assets	11.69%	11.81%
Tier 1 leverage capital to average assets	0.0780	0.0767
Capital required for capital adequacy	$ 88,737	$ 86,162
Tier 1 capital required for capital adequacy	66,553	64,621
Common equity tier 1 capital required for capital adequacy	49,915	48,466
Tier 1 leverage capital required for capital adequacy	$ 66,495	$ 66,295
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	0.0400	0.0400
Capital required to be well capitalized	$ 110,921	$ 107,702
Tier 1 capital required to be well capitalized	88,737	86,162
Common equity tier 1 capital required to be well capitalized	72,099	70,006
Tier 1 leverage capital required to be well capitalized	$ 83,118	$ 82,868
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	0.0800	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	0.0500	0.0500