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Note 6 - (Loss) Income Per Common Share - Reconciliation of Weighted Average Shares Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2023
Jul. 02, 2023
Jul. 03, 2022
Jul. 03, 2022
Jul. 02, 2023
Jul. 03, 2022
Jul. 03, 2022
Net income (loss) income as reported $ 213 $ 213 $ (629) $ (629) $ 38 $ (392) $ (392)
Less distributed and undistributed earnings allocable to restricted award holders (5)   0   (1)   0
Net income (loss) allocable to common stockholders $ 208   $ (629)   $ 37   $ (392)
Basic (in dollars per share) $ 0.01 $ 0.01 $ (0.03) $ (0.03) $ 0.00 $ (0.02) $ (0.02)
Diluted (in dollars per share) $ 0.01 $ 0.01 $ (0.03) $ (0.03) $ 0.00 $ (0.02) $ (0.02)
Basic (in shares) 21,852 21,852 21,723 21,723 21,824 21,700 21,700
Weighted average additional shares assuming conversion of potential common shares (in shares) 594   0   633   0
Weighted average shares outstanding – diluted (in shares) 22,446 22,446 21,723 21,723 22,457 21,700 21,700