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Note 7 - Property Insurance Settlement (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 01, 2018
Jul. 02, 2017
Proceeds from Insurance Settlement, Investing Activities $ 2,447,000 $ 2,275,000 $ 0
Gain on Business Interruption Insurance Recovery $ 2,275,000 $ 2,275,000 $ 0