Note P - Fair Value Measurements and Disclosures - Assets Measured at Fair Value on Non-Recurring Basis of Impairment Loans (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Impaired loans	$ 764	$ 2,927
Fair Value, Inputs, Level 1 [Member]
Impaired loans	$ 764	$ 2,927