Note B - Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available for sale securities, due in one year or less, amortized cost	$ 28,468
Available for sale securities, due in one year or less, fair value	28,485
Available for sale securities, due after one year through five years, amortized cost	38,782
Available for sale securities, due after one year through five years, fair value	38,569
Available for sale securities, due after five years through ten years, amortized cost	20,517
Available for sale securities, due after five years through ten years, fair value	20,522
Available for sale securities, due after ten years, amortized cost	2,500
Available for sale securities, due after ten years, fair value	2,582
Available for sale securities, mortgage backed securities, amortized cost	104,414
Available for sale securities, mortgage backed securities, fair value	106,153
Available for sale securities, amortized cost	194,681	$ 226,743
Available for sale securities, fair value	196,311	222,110
Held to maturity securities, due in one year or less, amortized cost	2,718
Held to maturity securities, due in one year or less, fair value	2,722
Held to maturity securities, due after one years through five years, amortized cost	17,036
Held to maturity securities, due after one year through five years, fair value	17,342
Held to maturity securities, due after five years through ten years, amortized cost	24,209
Held to maturity securities, due after five years through ten years, fair value	24,407
Held to maturity securities, due after ten years, amortized cost	8,268
Held to maturity securities, due after ten years, fair value	8,659
Held to maturity securities, amortized cost	52,231	54,598
Held to maturity securities, fair value	$ 53,130	$ 53,459