Note 9 - Fair Value Measurements - Recurring Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025
Commodity futures – financial assets, net	$ 246	$ (349)
Total	246	(349)
Commodity futures – financial assets, net	(246)	349
Total	(246)	349
Fair Value, Inputs, Level 1 [Member]
Commodity futures – financial assets, net		(349)
Total	246	(349)
Commodity futures – financial assets, net		349
Total	(246)	349
Fair Value, Inputs, Level 2 [Member]
Commodity futures – financial assets, net	0	(0)
Total	0	(0)
Commodity futures – financial assets, 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 assets, net	0	0
Total	$ 0	$ 0