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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019
Number of Reportable Segments	3
LIFO Inventory Amount	$ 55.4	$ 50.3
Percentage of LIFO Inventory	11.40%	21.00%
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	51.00%	56.00%	57.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top 20 [Member]
Concentration Risk, Percentage	23.00%	25.00%	29.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Largest Customer [Member]
Concentration Risk, Percentage	2.00%	2.00%	5.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Industrial Machinery and Equipment Manufacturers and Fabricators [Member]
Concentration Risk, Percentage	47.00%	45.00%	46.00%

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