Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions		12 Months Ended
Jan. 01, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
LIFO Inventory Amount		$ 46.3	$ 55.4
Percentage of LIFO Inventory		11.10%	11.40%
Maximum [Member]
Property, Plant and Equipment, Useful Life		30 years
Steel Requirements [Member] \| Supplier Concentration Risk [Member] \| Three Largest Suppliers [Member]
Concentration Risk, Percentage		39.00%	51.00%	56.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Top 20 [Member]
Concentration Risk, Percentage	23.00%	26.00%		25.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Largest Customer [Member]
Concentration Risk, Percentage		3.00%	2.00%	2.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Industrial Machinery and Equipment Manufacturers and Fabricators [Member]
Concentration Risk, Percentage		52.00%	47.00%	45.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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