Note I - Fair Value Measurements - Recurring Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Commodity futures – financial assets, net	$ 28	$ 1,612
Total	28	1,612
Commodity futures – financial liabilities, net	(28)	(1,612)
Total	(28)	(1,612)
Fair Value, Inputs, Level 1 [Member]
Commodity futures – financial assets, net		1,612
Total	28	1,612
Commodity futures – financial liabilities, net		(1,612)
Total	(28)	(1,612)
Fair Value, Inputs, Level 2 [Member]
Commodity futures – financial assets, net	0	(0)
Total	0	(0)
Commodity futures – financial liabilities, net	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Commodity futures – financial assets, net	0	(0)
Total	0	(0)
Commodity futures – financial liabilities, net	0	0
Total	$ 0	$ 0