Note A - Overview and Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Balance at beginning of year	$ 266	$ 241
Net charges to expense	(92)	95
Amounts recovered against the allowance	(11)	(70)
Balance at end of year	$ 163	$ 266