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Note 9 - 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 9 Months Ended
Oct. 04, 2020
Sep. 29, 2019
Oct. 04, 2020
Sep. 29, 2019
Net income (loss) $ 3,495 $ (1,557) $ 2,842 $ (3,090)
Less distributed and undistributed earnings allocable to restricted award holders (15) 0 (12) 0
Less dividends declared attributable to restricted award holders 0 0 0 0
Net income (loss) allocable to common stockholders $ 3,480 $ (1,557) $ 2,830 $ (3,090)
Basic (in dollars per share) $ 0.17 $ (0.07) $ 0.14 $ (0.15)
Diluted (in dollars per share) $ 0.17 $ (0.07) $ 0.14 $ (0.15)
Basic (in shares) 21,064 20,941 21,026 20,829
Weighted average additional shares assuming conversion of potential common shares (in shares) 16 0 0 0
Weighted average shares outstanding – diluted (in shares) 21,080 20,941 21,026 20,829