Note 4 - Revenue Recognition - Disaggregation of Revenues, Percentage (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Hot Rolled	100.00%	100.00%	100.00%
Hot Rolled Products [Member]
Hot Rolled	29.80%	31.40%	29.70%
Plate Products [Member]
Hot Rolled	13.30%	10.40%	9.60%
Cold Rolled Products [Member]
Hot Rolled	4.70%	7.00%	5.90%
Coated Products [Member]
Hot Rolled	4.50%	7.70%	9.60%
Specialty [Member]
Hot Rolled	30.30%	25.30%	23.50%
Tube Products [Member]
Hot Rolled	16.70%	16.50%	18.70%
Product and Service, Other [Member]
Hot Rolled	0.70%	1.70%	3.00%
Carbon Flat Products [Member]
Hot Rolled	53.00%	58.10%	55.90%
Carbon Flat Products [Member] | Hot Rolled Products [Member]
Hot Rolled	29.80%	31.40%	29.70%
Carbon Flat Products [Member] | Plate Products [Member]
Hot Rolled	13.30%	10.40%	9.60%
Carbon Flat Products [Member] | Cold Rolled Products [Member]
Hot Rolled	4.70%	7.00%	5.90%
Carbon Flat Products [Member] | Coated Products [Member]
Hot Rolled	4.50%	7.70%	9.60%
Carbon Flat Products [Member] | Specialty [Member]
Hot Rolled	0.00%	0.00%	0.00%
Carbon Flat Products [Member] | Tube Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Carbon Flat Products [Member] | Product and Service, Other [Member]
Hot Rolled	0.70%	1.60%	1.10%
Specialty Metals Flat Products [Member]
Hot Rolled	30.30%	25.40%	25.40%
Specialty Metals Flat Products [Member] | Hot Rolled Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Plate Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Cold Rolled Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Coated Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Specialty [Member]
Hot Rolled	30.30%	25.30%	23.50%
Specialty Metals Flat Products [Member] | Tube Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Product and Service, Other [Member]
Hot Rolled	0.00%	0.10%	1.90%
Tubular and Pipe Products [Member]
Hot Rolled	16.70%	16.50%	18.70%
Tubular and Pipe Products [Member] | Hot Rolled Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Plate Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Cold Rolled Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Coated Products [Member]
Hot Rolled	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Specialty [Member]
Hot Rolled	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Tube Products [Member]
Hot Rolled	16.70%	16.50%	18.70%
Tubular and Pipe Products [Member] | Product and Service, Other [Member]
Hot Rolled	0.00%	0.00%	0.00%