Note 11 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Mar. 31, 2025
Net Sales	$ 167,974	$ 94,074	$ 455,134	$ 315,384
Cost of Goods and Services Sold	4,711	2,219	11,382	7,348
Depreciation and amortization	1,007	827	2,791	2,445
Cost of Product and Service Sold	164,075		441,313
EARNINGS (LOSS) FROM OPERATIONS:	3,899	(1,187)	13,821	(2,809)
Gain on economic hedges of risk	1,381	264	2,508	5,833
Interest expense	(1,278)	(632)	(2,710)	(2,182)
Other income	2	3	7	3
EARNINGS BEFORE INCOME TAXES	4,004	(1,552)	13,626	845
Gain on disposal of property, plant and equipment	0	375	0	153
Identifiable assets	311,859		311,859		$ 226,822
Material Sold Expense [Member]
Cost of Goods and Services Sold	137,472	78,509	369,258	263,165
Processing and Warehouse Expense [Member]
Cost of Goods and Services Sold	11,199	7,471	29,591	24,030
Delivery Expense [Member]
Cost of Goods and Services Sold	7,247	4,941	20,781	16,373
Commercial Expense [Member]
Cost of Goods and Services Sold	2,439	1,669	7,510	4,985
Loss on Disposal of Property, Plant and Equipment [Member]
Cost of Product and Service Sold		95,636		318,346
Flat-roll [Member]
Net Sales	153,032	86,144	420,439	286,910
Tubular [Member]
Net Sales	14,942	7,930	34,695	28,474
Operating Segments [Member]
Identifiable assets	305,887		305,887		221,682
Operating Segments [Member] | Flat-roll [Member]
Net Sales	153,032	86,144	420,439	286,910
Depreciation and amortization	867	726	2,461	2,115
Cost of Product and Service Sold	145,766		398,687
EARNINGS (LOSS) FROM OPERATIONS:	7,266	1,295	21,752	6,630
Gain on disposal of property, plant and equipment		0		(222)
Identifiable assets	282,597		282,597		204,890
Operating Segments [Member] | Flat-roll [Member] | Material Sold Expense [Member]
Cost of Goods and Services Sold	126,816	72,313	345,790	240,105
Operating Segments [Member] | Flat-roll [Member] | Processing and Warehouse Expense [Member]
Cost of Goods and Services Sold	8,896	5,544	23,309	17,498
Operating Segments [Member] | Flat-roll [Member] | Delivery Expense [Member]
Cost of Goods and Services Sold	6,962	4,759	20,231	15,854
Operating Segments [Member] | Flat-roll [Member] | Commercial Expense [Member]
Cost of Goods and Services Sold	2,225	1,507	6,896	4,486
Operating Segments [Member] | Flat-roll [Member] | Loss on Disposal of Property, Plant and Equipment [Member]
Cost of Product and Service Sold		84,849		280,058
Operating Segments [Member] | Tubular [Member]
Net Sales	14,942	7,930	34,695	28,474
Depreciation and amortization	61	72	162	240
Cost of Product and Service Sold	13,519	8,539	31,076	30,850
EARNINGS (LOSS) FROM OPERATIONS:	1,423	(234)	3,619	(2,001)
Gain on disposal of property, plant and equipment		375		375
Identifiable assets	23,290		23,290		16,792
Operating Segments [Member] | Tubular [Member] | Material Sold Expense [Member]
Cost of Goods and Services Sold	10,656	6,196	23,468	23,060
Operating Segments [Member] | Tubular [Member] | Processing and Warehouse Expense [Member]
Cost of Goods and Services Sold	2,303	1,927	6,282	6,532
Operating Segments [Member] | Tubular [Member] | Delivery Expense [Member]
Cost of Goods and Services Sold	285	182	550	519
Operating Segments [Member] | Tubular [Member] | Commercial Expense [Member]
Cost of Goods and Services Sold	214	162	614	499
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Net Sales		0		0
Cost of Goods and Services Sold	4,711	2,219	11,382	7,348
Depreciation and amortization	79	29	168	90
Cost of Product and Service Sold	4,790	2,248	11,550	7,438
EARNINGS (LOSS) FROM OPERATIONS:	(4,790)	(2,248)	(11,550)	(7,438)
Gain on disposal of property, plant and equipment		$ 0		$ 0
Identifiable assets	$ 5,972		$ 5,972		$ 5,140