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Note 5 - Inventories (Details Textual) - USD ($)
3 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Mar. 31, 2020
Inventory, LIFO Reserve $ 142,126,000 $ 164,517,000 $ 144,267,000
Inventory, LIFO Reserve, Period Charge $ (2,141,000) $ 3,176,000