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Note 6 - Earnings (Loss) 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
Jun. 30, 2024
Jul. 02, 2023
Jun. 30, 2024
Jul. 02, 2023
Net income (loss) income as reported $ 16 $ 213 $ (2,205) $ 38
Less distributed and undistributed earnings allocable to restricted award holders 0 (5) 0 (1)
Net income (loss) allocable to common stockholders $ 16 $ 208 $ (2,205) $ 37
Basic (in dollars per share) $ 0 $ 0.01 $ (0.1) $ 0
Diluted (in dollars per share) $ 0 $ 0.01 $ (0.1) $ 0
Basic (in shares) 21,989 21,852 21,973 21,824
Weighted average additional shares assuming conversion of potential common shares (in shares) 299 594 0 633
Weighted average shares outstanding – diluted (in shares) 22,288 22,446 21,973 22,457