Note 3 - Net Loss Per Share (Details Textual) - shares shares in Millions	12 Months Ended
	Jan. 01, 2023	Jan. 02, 2022	Jan. 03, 2021	May 29, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0.8
Common Stock [Member] | Maximum [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				0.4
Share-Based Payment Arrangement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		0.7	0.9