Note B - Securities - Amortized Cost and Fair Value Of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Available for sale securities, amortized cost	$ 379,195		$ 397,926
Available for sale securities, gross unrealized gains	86		38
Available for sale securities, gross unrealized losses	(39,804)		(47,796)
Available for sale securities, fair value	339,477		350,168
Held to maturity securities, amortized cost	150,941		195,217
Held to maturity securities, fair value	138,523		180,050
Held to maturity securities, allowance for credit loss	30	$ 0	0
Held to maturity securities, net carrying amount	150,911		195,217
Approximation [Member]
Available for sale securities, amortized cost	150,941
Held to maturity securities, amortized cost	150,941		195,217
Held to maturity securities, gross unrealized gains	64		52
Held to maturity securities, gross unrealized losses	12,482		15,219
Held to maturity securities, fair value	138,523
Held to maturity securities, allowance for credit loss	(30)
Held to maturity securities, net carrying amount	150,911		180,050
US Treasury Securities [Member]
Available for sale securities, amortized cost	123,945		118,782
Available for sale securities, gross unrealized gains	55		0
Available for sale securities, gross unrealized losses	(8,542)		(10,414)
Available for sale securities, fair value	115,458		108,368
Held to maturity securities, amortized cost	59,901		94,339
Held to maturity securities, gross unrealized gains	41		0
Held to maturity securities, gross unrealized losses	907		1,288
Held to maturity securities, fair value	59,035
Held to maturity securities, allowance for credit loss	0	0
Held to maturity securities, net carrying amount	59,901		93,051
Collateralized Mortgage-Backed Securities [Member]
Available for sale securities, amortized cost	52,374		61,280
Available for sale securities, gross unrealized gains	14		36
Available for sale securities, gross unrealized losses	(4,603)		(4,877)
Available for sale securities, fair value	47,785		56,439
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities, amortized cost	101,560		102,428
Available for sale securities, gross unrealized gains	0		2
Available for sale securities, gross unrealized losses	(20,332)		(24,446)
Available for sale securities, fair value	81,228		77,984
Held to maturity securities, amortized cost	91,040		100,878
Held to maturity securities, gross unrealized gains	23		52
Held to maturity securities, gross unrealized losses	11,575		13,931
Held to maturity securities, fair value	79,488
Held to maturity securities, allowance for credit loss	(30)	$ 0
Held to maturity securities, net carrying amount	91,010		86,999
Collateralized Mortgage Obligations [Member]
Available for sale securities, amortized cost	101,316		115,436
Available for sale securities, gross unrealized gains	17		0
Available for sale securities, gross unrealized losses	(6,327)		(8,059)
Available for sale securities, fair value	$ 95,006		$ 107,377

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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