Note 11 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands						12 Months Ended
	Dec. 05, 2024	Mar. 13, 2024	Mar. 21, 2023	Sep. 14, 2022	Feb. 09, 2022	Dec. 29, 2024	Dec. 31, 2023	Jan. 01, 2023
Common Stock, Shares Authorized (in shares)						200,000	200,000
Preferred Stock, Shares Authorized (in shares)						10,000	10,000
Proceeds from Issuance of Common Stock						$ 6,810	$ 2,313	$ 4,682
Payments of Stock Issuance Costs						24	$ 20	$ 17
Warrants Issued in Connection with Underwritten Public Offering [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 19.32
Warrants Issued in Connection with Underwritten Public Offering [Member] | Maximum [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								386
Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)			450	487	310
Proceeds from Issuance of Common Stock			$ 2,300	$ 3,200	$ 1,500
Shares Issued, Price Per Share (in dollars per share)			$ 5.14	$ 6.57	$ 4.78
Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	424	223	450	487	310
Proceeds from Issuance of Common Stock	$ 3,200	$ 3,500	$ 2,300	$ 3,200	$ 1,500	$ 6,800
Payments of Stock Issuance Costs	$ 27	$ 24
Shares Issued, Price Per Share (in dollars per share)	$ 7.67	$ 16