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Note 6 - Income (Loss) Per Common Share - Reconciliation of Weighted Average Shares Outstanding Used in Calculation of Basic and Diluted (Loss) Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 03, 2022
Apr. 04, 2021
Net income (loss) $ 237 $ (1,630)
Less distributed and undistributed earnings allocable to restricted awarded holders (2) 0
Net income (loss) allocable to common stockholders $ 235 $ (1,630)
Basic (in dollars per share) $ 0.01 $ (0.08)
Diluted (in dollars per share) $ 0.01 $ (0.08)
Basic (in shares) 21,681 21,394
Weighted average additional shares assuming conversion of potential common shares (in shares) 994 0
Weighted average shares outstanding – diluted (in shares) 22,675 21,394