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Note 7 - Earnings (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. 04, 2021
Jul. 05, 2020
Jul. 04, 2021
Jul. 05, 2020
Net income (loss) $ 3,823 $ (348) $ 2,193 $ (653)
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 income (loss) allocable to common stockholders $ 3,823 $ (348) $ 2,193 $ (653)
Basic (in dollars per share) $ 0.18 $ (0.02) $ 0.10 $ (0.03)
Diluted (in dollars per share) $ 0.17 $ (0.02) $ 0.10 $ (0.03)
Basic (in shares) 21,356 21,016 21,475 21,005
Weighted average additional shares assuming conversion of potential common shares (in shares) 1,490 0 1,504 0
Weighted average shares outstanding – diluted (in shares) 22,846 21,016 22,979 21,005