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Note 7 - Earnings (Loss) Per Common Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jul. 04, 2021
Jul. 05, 2020
Jul. 04, 2021
Jul. 05, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 4,000 0 4,000 0