Note 19 - Retirement Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2005
Defined Contribution Plan, Administrative Expense	$ 4.7	$ 4.1	$ 3.8
Supplemental Employee Retirement Plan [Member]
Defined Contribution Plan Vesting Period (Year)	7 years
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	$ 11.6	$ 7.7
Supplemental Employee Retirement Plan [Member] | Minimum [Member]
Defined Contribution Plan, Compensation Percentage Multiplier				6.50%
Supplemental Employee Retirement Plan [Member] | Maximum [Member]
Defined Contribution Plan, Compensation Percentage Multiplier				13.00%
Non-union Flat Rolled Segments’ 401K Retirement Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Action Stainless & Alloy’s 401(k) Retirement Plans [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Action Stainless & Alloy’s 401(k) Retirement Plans [Member] | First Step of Percent Match [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Action Stainless & Alloy’s 401(k) Retirement Plans [Member] | Second Step of Percent Match [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	2.00%