Note 10 - Equity, Share-based Compensation, Warrants and Securities Offerings - Warrants Activity (Details) - $ / shares			12 Months Ended
	Jan. 01, 2023	Jan. 01, 2022	Dec. 31, 2023	Dec. 31, 2022
Outstanding, balance (in shares)	2,298,769	875,067	2,298,769	875,067
Outstanding, weighted average exercise price (in dollars per share)	$ 1.76	$ 9.76	$ 1.76	$ 9.76
Nonvested, weighted average expense period (Year)	2 years 10 months 24 days	1 year 4 months 24 days	4 years 1 month 6 days	2 years 10 months 24 days
Issued (in shares)			4,324,802	2,063,000
Issued, weighted average exercise price (in dollars per share)			$ 0.21	$ 1.61
Issued, weighted average remaining contractual life (Year)			4 years 1 month 6 days	3 years 1 month 6 days
Before adjustment (in shares)			0	230,769
Before adjustment, weighted average exercise price (in dollars per share)			$ 0	$ 10
Before adjustment, weighted average remaining contractual life (Year)				4 years
After adjustment (in shares)			0	(230,769)
After adjustment, weighted average exercise price (in dollars per share)			$ 0	$ 2.72
After adjustment, weighted average remaining contractual life (Year)				4 years
Forfeited (in shares)			(2,230,769)
Forfeited, weighted average exercise price (in dollars per share)			$ 1.72
Forfeited, weighted average remaining contractual life (Year)			2 years 10 months 24 days
Expired (in shares)			(5,000)	(639,298)
Expired, weighted average exercise price (in dollars per share)			$ 20	$ 9.6
Outstanding, balance (in shares)			4,387,802	2,298,769
Outstanding, weighted average exercise price (in dollars per share)			$ 0.21	$ 1.76