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Note 6 - (Loss) Income Per Common Share - Reconciliation of Weighted Average Shares Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2023
Oct. 02, 2022
Oct. 01, 2023
Oct. 02, 2022
Net income (loss) income as reported $ (555) $ (2,242) $ (517) $ (2,634)
Less distributed and undistributed earnings allocable to restricted award holders 0 0 0 0
Net income (loss) allocable to common stockholders $ (555) $ (2,242) $ (517) $ (2,634)
Basic (in dollars per share) $ (0.03) $ (0.10) $ (0.02) $ (0.12)
Diluted (in dollars per share) $ (0.03) $ (0.10) $ (0.02) $ (0.12)
Basic (in shares) 21,880 21,740 21,848 21,716
Weighted average additional shares assuming conversion of potential common shares (in shares) 0 0 0 0
Weighted average shares outstanding – diluted (in shares) 21,880 21,740 21,848 21,716