Note I - Fair Value Measurements - Recurring Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Mar. 31, 2022
Commodity futures – financial liabilities, net		$ (720)	$ (1,676)
Total		(720)	(1,676)
Fair Value, Inputs, Level 1 [Member]
Commodity futures – financial liabilities, net	$ (720)		(1,676)
Total	(720)		(1,676)
Fair Value, Inputs, Level 2 [Member]
Commodity futures – financial liabilities, net	0		0
Total	$ 0		0
Fair Value, Inputs, Level 3 [Member]
Commodity futures – financial liabilities, net		0	0
Total		$ 0	$ 0