Note D - Investment in Equity Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 03, 2021	Jul. 03, 2021	Jan. 02, 2021
Equity Securities without Readily Determinable Fair Value, Price Adjustment, Cumulative Amount	$ 0	$ 0
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount	0	0
Other Assets [Member]
Equity Securities without Readily Determinable Fair Value, Amount	$ 20,000	$ 20,000	$ 20,000