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Note 10 - Per Share Data (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 40,000 0 40,000