Note 15 - Equity Incentive Plans - Fair Value Assumptions (Details)		12 Months Ended
	Dec. 27, 2023	Dec. 31, 2023	Dec. 31, 2022
Minimum [Member]
Expected volatility		100.27%	90.50%
Risk-free interest rate		3.36%	1.83%
Expected lives (years) (Year)		1 year	5 years
Maximum [Member]
Expected volatility		103.58%	92.30%
Risk-free interest rate		5.36%	2.76%
Expected lives (years) (Year)		6 years 3 months	6 years 3 months
Merger Agreement [Member]
Expected volatility	93.30%
Risk-free interest rate	4.79%
Expected lives (years) (Year)	1 year