Note 12 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Net Sales	$ 167,974	$ 94,074	$ 455,134	$ 315,384
Flat-roll [Member]
Net Sales	153,032	86,144	420,439	286,910
Flat-roll [Member] | Prime Coil [Member]
Net Sales	151,956	85,131	416,496	283,197
Flat-roll [Member] | Customer Owned [Member]
Net Sales	1,076	1,013	3,943	3,713
Tubular [Member]
Net Sales	14,942	7,930	34,695	28,474
Tubular [Member] | Manufactured Pipe [Member]
Net Sales	$ 14,942	$ 7,930	$ 34,695	$ 28,474