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Note 7 - Earnings Per Common Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Oct. 03, 2021
Oct. 04, 2020
Oct. 03, 2021
Oct. 04, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 38,000 2,489,250 38,000 2,754,750