Note F - Cash, Cash Equivalents And Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 29, 2024	Dec. 31, 2023
Amortized Cost	$ 16,803	$ 26,428
Fair Value	16,888	26,454
Gross Unrealized Gains	84	58
Gross Unrealized Losses	0	31
Certificates of Deposit [Member]
Amortized Cost	9,942	21,305
Fair Value	10,011	21,331
Gross Unrealized Gains	69	58
Gross Unrealized Losses	0	31
Variable Rate Demand Obligation [Member]
Amortized Cost	4,292	5,123
Fair Value	4,292	5,123
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	$ 0
Other Fixed Rate Securities [Member]
Amortized Cost	2,569
Fair Value	2,585
Gross Unrealized Gains	15
Gross Unrealized Losses	$ 0