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Note 3 - Net Loss Per Share (Details Textual)		12 Months Ended
Note 3 - Net Loss Per Share (Details Textual)	Dec. 06, 2019	Jan. 03, 2021 shares	Dec. 29, 2019 shares	Dec. 30, 2018 shares	May 29, 2018 shares
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	14
Common Stock [Member] \| Maximum [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					386,000
Share-based Payment Arrangement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		921,000	563,000	435,000