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Note 9 - (Loss) 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 6 Months Ended
Jul. 05, 2020
Jun. 30, 2019
Jul. 05, 2020
Jun. 30, 2019
Net (loss) income $ (348) $ 1,503 $ (653) $ (1,533)
Less distributed and undistributed earnings allocable to restricted award holders 0 (28) 0 0
Less dividends declared attributable to restricted award holders 0 0 0 0
Net (loss) income allocable to common stockholders $ (348) $ 1,475 $ (653) $ (1,533)
Basic (in dollars per share) $ (0.02) $ 0.07 $ (0.03) $ (0.07)
Diluted (in dollars per share) $ (0.02) $ 0.07 $ (0.03) $ (0.07)
Basic (in shares) 21,016 20,875 21,005 20,772
Weighted average additional shares assuming conversion of potential common shares (in shares) 0 0 0 0
Weighted average shares outstanding – diluted (in shares) 21,016 20,875 21,005 20,772