Note H - Regulatory Matters - Capital Amounts and Ratios Under CBLR (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Tier 1 Capital to Average Assets, Actual Capital, Amount	$ 435,643	$ 430,366
Tier 1 Capital to Average Assets, Actual Capital, Ratio	0.1005	0.0983
Tier 1 capital to average assets, to be well capitalized, amount	$ 389,969	$ 394,017
Tier 1 capital to average assets, to be well capitalized, ratio	0.09	0.09
Bank [Member]
Tier 1 Capital to Average Assets, Actual Capital, Amount	$ 438,648	$ 429,377
Tier 1 Capital to Average Assets, Actual Capital, Ratio	0.1013	0.0981
Tier 1 capital to average assets, to be well capitalized, amount	$ 389,874	$ 393,883
Tier 1 capital to average assets, to be well capitalized, ratio	0.09	0.09