Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021
Number of Reportable Segments	3
LIFO Inventory Amount	$ 38.2	$ 46.3
Percentage of LIFO Inventory	9.90%	11.10%
Property, Plant and Equipment, Useful Life (Year)	7 years
Software and Software Development Costs [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Minimum [Member] \| Software and Software Development Costs [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	30 years
Maximum [Member] \| Software and Software Development Costs [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Steel Requirements [Member] \| Supplier Concentration Risk [Member] \| Three Largest Suppliers [Member]
Concentration Risk, Percentage	40.00%	39.00%	51.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Top 20 [Member]
Concentration Risk, Percentage	29.00%	26.00%	23.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Largest Customer [Member]
Concentration Risk, Percentage	3.00%	3.00%	2.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Industrial Machinery and Equipment Manufacturers and Fabricators [Member]
Concentration Risk, Percentage	48.00%	52.00%	47.00%

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.

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