Note 8 - Share-based Compensation Plans - Annualized Weighted Average Values of Significant Assumptions Used to Estimate Fair Values (Details) - Share-Based Payment Arrangement, Option [Member] - $ / shares	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 30, 2023	Dec. 30, 2023	Dec. 30, 2023
Risk-free interest rate, Minimum (Rate)	4.16%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	4.24%			3.43%	4.33%
Expected volatility	61.20%				59.70%
Expected dividend yield	0.00%				0.00%
Weighted average fair value of grants (in dollars per share)	$ 2.29		$ 2.91
Minimum [Member]
Expected life in years (Year)	5 years	5 years
Maximum [Member]
Expected life in years (Year)	5 years 6 months	7 years 7 months 6 days