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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 6 Months Ended
Jul. 03, 2022
Jul. 04, 2021
Jul. 03, 2022
Jul. 04, 2021
Net (loss) income $ (629) $ 3,823 $ (392) $ 2,193
Less distributed and undistributed earnings allocable to restricted award holders 0 0 0 0
Less dividends declared attributable to restricted award holders 0 0 0 0
Net (loss) income allocable to common stockholders $ (629) $ 3,823 $ (392) $ 2,193
Basic (in dollars per share) $ (0.03) $ 0.18 $ (0.02) $ 0.10
Diluted (in dollars per share) $ (0.03) $ 0.17 $ (0.02) $ 0.10
Basic (in shares) 21,723 21,356 21,700 21,475
Weighted average additional shares assuming conversion of potential common shares (in shares) 0 1,490 0 1,504
Weighted average shares outstanding – diluted (in shares) 21,723 22,846 21,700 22,979