Note C - Loans - Impaired Loans, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
With no related allowance recorded, Unpaid Principal Balance	$ 9,415	$ 8,764
With no related allowance recorded, Recorded Investment	9,415	8,115
With no related allowance recorded, Average Recorded Investment	9,604	8,818
With no related allowance recorded, Interest Income Recognized	29	29
With a related allowance recorded, Unpaid Principal Balance	886	1,316
With a related allowance recorded, Recorded Investment	886	1,229
Related Allowance	122	384
With a related allowance recorded, Average Recorded Investment	885	1,222
With a related allowance recorded, Interest Income Recognized	27	25
Total by class of loans, Unpaid Principal Balance	10,301	10,080
Total by class of loans, Recorded Investment	10,301	9,344
Total by class of loans, Average Recorded Investment	10,489	10,040
Total by class of loans, Interest Income Recognized	56	54
Real Estate, Construction [Member]
With no related allowance recorded, Unpaid Principal Balance	292	1,171
With no related allowance recorded, Recorded Investment	292	784
With no related allowance recorded, Average Recorded Investment	312	785
With no related allowance recorded, Interest Income Recognized
With a related allowance recorded, Unpaid Principal Balance	223	742
With a related allowance recorded, Recorded Investment	223	655
Related Allowance	20	283
With a related allowance recorded, Average Recorded Investment	230	633
With a related allowance recorded, Interest Income Recognized
Total by class of loans, Unpaid Principal Balance	515	1,913
Total by class of loans, Recorded Investment	515	1,439
Total by class of loans, Average Recorded Investment	542	1,418
Total by class of loans, Interest Income Recognized
Real Estate, Mortgage [Member]
With no related allowance recorded, Unpaid Principal Balance	8,906	5,508
With no related allowance recorded, Recorded Investment	8,906	5,474
With no related allowance recorded, Average Recorded Investment	9,075	5,826
With no related allowance recorded, Interest Income Recognized	29	29
With a related allowance recorded, Unpaid Principal Balance	624	574
With a related allowance recorded, Recorded Investment	624	574
Related Allowance	98	101
With a related allowance recorded, Average Recorded Investment	614	589
With a related allowance recorded, Interest Income Recognized	27	25
Total by class of loans, Unpaid Principal Balance	9,530	6,082
Total by class of loans, Recorded Investment	9,530	6,048
Total by class of loans, Average Recorded Investment	9,689	6,415
Total by class of loans, Interest Income Recognized	56	54
Commercial And Industrial Loan [Member]
With no related allowance recorded, Unpaid Principal Balance	217	2,083
With no related allowance recorded, Recorded Investment	217	1,855
With no related allowance recorded, Average Recorded Investment	217	2,204
With no related allowance recorded, Interest Income Recognized
With a related allowance recorded, Unpaid Principal Balance	39	2,083
With a related allowance recorded, Recorded Investment	39	1,855
Related Allowance	4
With a related allowance recorded, Average Recorded Investment	41	2,204
With a related allowance recorded, Interest Income Recognized
Total by class of loans, Unpaid Principal Balance	256
Total by class of loans, Recorded Investment	256
Total by class of loans, Average Recorded Investment	258
Total by class of loans, Interest Income Recognized
Other Loan [Member]
With no related allowance recorded, Unpaid Principal Balance		2
With no related allowance recorded, Recorded Investment		2
With no related allowance recorded, Average Recorded Investment		3
With no related allowance recorded, Interest Income Recognized
Related Allowance
Total by class of loans, Unpaid Principal Balance		2
Total by class of loans, Recorded Investment		2
Total by class of loans, Average Recorded Investment		3
Total by class of loans, Interest Income Recognized