Note B - Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for sale securities, due in one year or less, amortized cost	$ 25,294
Available for sale securities, due in one year or less, fair value	25,136
Available for sale securities, due after one year through five years, amortized cost	29,675
Available for sale securities, due after one year through five years, fair value	27,822
Available for sale securities, due after five years through ten years, amortized cost	101,612
Available for sale securities, due after five years through ten years, fair value	85,596
Available for sale securities, due after ten years, amortized cost	64,629
Available for sale securities, due after ten years, fair value	47,798
Available for sale securities, amortized cost	115,436
Available for sale securities, fair value	107,377
Available for sale securities, amortized cost, total	397,926	$ 378,961
Available for sale securities, fair value, total	350,168	376,803
Held to maturity securities, due in one year or less, amortized cost	66,001
Held to maturity securities, due in one year or less, fair value	65,828
Held to maturity securities, due after one years through five years, amortized cost	48,774
Held to maturity securities, due after one year through five years, fair value	47,053
Held to maturity securities, due after five years through ten years, amortized cost	41,688
Held to maturity securities, due after five years through ten years, fair value	36,578
Held to maturity securities, due after ten years, amortized cost	38,754
Held to maturity securities, due after ten years, fair value	30,591
Held to maturity securities, amortized cost	195,217	110,208
Held to maturity securities, fair value	180,050	111,340
Collateralized Mortgage-Backed Securities [Member]
Available for sale securities, amortized cost	61,280
Available for sale securities, fair value	56,439
Available for sale securities, amortized cost, total	61,280	71,187
Available for sale securities, fair value, total	$ 56,439	$ 71,982