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Note 7 - Earnings 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 9 Months Ended
Oct. 03, 2021
Oct. 04, 2020
Oct. 03, 2021
Oct. 04, 2020
Net income $ 294 $ 3,495 $ 2,487 $ 2,842
Less distributed and undistributed earnings allocable to restricted award holders (2) (15) (7) (12)
Less dividends declared attributable to restricted award holders 0 0 0 0
Net income allocable to common stockholders $ 292 $ 3,480 $ 2,480 $ 2,830
Basic (in dollars per share) $ 0.01 $ 0.17 $ 0.12 $ 0.14
Diluted (in dollars per share) $ 0.01 $ 0.17 $ 0.11 $ 0.14
Basic (in shares) 21,536 21,064 21,522 21,026
Weighted average additional shares assuming conversion of potential common shares (in shares) 1,404 16 1,472 0
Weighted average shares outstanding – diluted (in shares) 22,940 21,080 22,994 21,026