Note G - Dividend Payment (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		9 Months Ended
	Sep. 14, 2021	Jun. 08, 2021	Mar. 24, 2021	Oct. 02, 2021	Oct. 03, 2020	Oct. 02, 2021	Oct. 03, 2020
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 0.14	$ 0.14	$ 0.14
Dividends, Common Stock, Cash	$ 1,900	$ 1,900	$ 1,900	$ 1,917	$ 1,984	$ 5,804	$ 5,515