Note 4 - Inventories - Inventories by Category and Impact of Using LIFO Method (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Mar. 31, 2022	Jan. 01, 2022
Finished products	$ 738,331	$ 385,681	$ 515,225
In process	67,380	23,652	26,468
Raw materials and supplies	218,572	165,491	99,611
FIFO Inventory Amount	1,024,283	574,824	641,304
Less excess of FIFO cost over LIFO cost	243,826	164,493	159,326
Inventories	$ 780,457	$ 410,331	$ 481,978