Note D - Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating lease expense	$ 1,161	$ 1,230
Financing lease expense	32	32
Short Term lease expense	27	19
Total lease expense	$ 1,220	$ 1,281
Weighted Average Remaining Lease Term (Years) - operating leases (Year)	6 years 1 month 28 days	7 years 1 month 24 days
Weighted Average Remaining Lease Term (Years) - financing leases (Year)	9 months 29 days	1 year 9 months 29 days
Weighted Average Discount Rate - operating leases	3.21%	3.22%
Weighted Average Discount Rate - financing leases	5.00%	5.00%
Operating cash flows from operating leases	$ 1,234	$ 1,287
Operating cash flows from financing lease	4	5
Financing cash flows from financing lease	19	18	$ 17
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 124