Note D - Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating lease expense	$ 1,146	$ 1,161
Financing lease expense	27	32
Short Term lease expense	22	27
Total lease expense	$ 1,195	$ 1,220
Weighted Average Remaining Lease Term (Years) - operating leases (Year)	5 years 1 month 6 days	6 years 1 month 28 days
Weighted Average Remaining Lease Term (Years) - financing leases (Year)		9 months 29 days
Weighted Average Discount Rate - operating leases	3.30%	3.21%
Weighted Average Discount Rate - financing leases	0.00%	5.00%
Operating cash flows from operating leases	$ 1,250	$ 1,234
Operating cash flows from financing lease	2	4
Financing cash flows from financing lease	63	19	$ 18
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 0