Note 10 - Equity, Share-based Compensation and Warrants - Restricted Stock Unit Activity (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Jan. 01, 2023	Jan. 01, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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
Restricted Stock Units (RSUs) [Member]
Nonvested, shares issued (in shares)	366,818	126,603	366,818	126,603
Nonvested, unrecognized stock compensation	$ 1,024	$ 658	$ 1,024	$ 658
Nonvested, average grant date fair value (in dollars per share)	$ 2.79	$ 5.2	$ 2.79	$ 5.2
Nonvested, weighted average expense period (Year)			2 months 12 days	2 years 9 months 18 days	10 months 24 days
Granted, nonvested, shares issued (in shares)			316,845	527,871
Granted, unrecognized stock compensation			$ 186	$ 1,680
Granted, average grant date fair value (in dollars per share)			$ 0.59	$ 3.18
Granted, weighted average expense period (Year)				2 years 8 months 12 days
Granted, unrecognized stock compensation			$ 186	$ 1,680
Granted, weighted average expense period (Year)				2 years 8 months 12 days
Before modification (in shares)				(17,050)
Before modification				$ (150)
Before modification (in dollars per share)				$ 8.77
Before modification (Year)				7 months 6 days
After modification (in shares)				17,050
After modification				$ 64
After modification (in dollars per share)				$ 3.73
Forfeited, shares issued (in shares)			(234,059)	(11,744)
Forfeited, unrecognized stock compensation			$ (892)	$ (68)
Forfeited, average grant date fair value (in dollars per share)			$ 3.81	$ 5.77
Vested with service (in shares)			(449,104)	(275,912)
Expensed			$ (317)	$ (1,160)
Forfeited, weighted average expense period (Year)			1 year 3 months 18 days
Nonvested, shares issued (in shares)			500	366,818	126,603
Nonvested, unrecognized stock compensation			$ 1	$ 1,024	$ 658
Nonvested, average grant date fair value (in dollars per share)			$ 1.28	$ 2.79	$ 5.2
Vested, balance (in shares)	224,725	86,505	224,725	86,505
Vested with service (in shares)			508,569	275,912
Issued at termination of service (in shares)				(83,725)
Issued at vesting (in shares)			(350,400)	(53,967)
Vested, balance (in shares)			382,894	224,725	86,505
Stock Units Issued (SUI) [Member]
Nonvested, shares issued (in shares)	160,000	0	160,000	0
Nonvested, unrecognized stock compensation	$ 201	$ 0	$ 201	$ 0
Nonvested, average grant date fair value (in dollars per share)	$ 1.26	$ 0	$ 1.26	$ 0
Nonvested, weighted average expense period (Year)			1 year 9 months 18 days	2 years 8 months 12 days
Granted, nonvested, shares issued (in shares)			6,132	160,000
Granted, unrecognized stock compensation			$ 5	$ 216
Granted, average grant date fair value (in dollars per share)			$ 0.74	$ 1.35
Granted, weighted average expense period (Year)				3 years
Granted, unrecognized stock compensation			$ 5	$ 216
Granted, weighted average expense period (Year)				3 years
Forfeited, shares issued (in shares)			0	0
Forfeited, unrecognized stock compensation			$ 0	$ 0
Forfeited, average grant date fair value (in dollars per share)			$ 0	$ 0
Vested with service (in shares)			(59,465)	0
Expensed			$ (80)	$ (15)
Nonvested, shares issued (in shares)			106,667	160,000	0
Nonvested, unrecognized stock compensation			$ 126	$ 201	$ 0
Nonvested, average grant date fair value (in dollars per share)			$ 1.18	$ 1.26	$ 0