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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Number of Reportable Segments	3
LIFO Inventory Amount	$ 50.3	$ 39.1
Percentage of LIFO Inventory	21.00%	14.30%
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	56.00%	57.00%	52.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top 20 [Member]
Concentration Risk, Percentage	25.00%	29.00%	29.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Largest Customer [Member]
Concentration Risk, Percentage	2.00%	5.00%	5.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Industrial Machinery and Equipment Manufacturers and Fabricators [Member]
Concentration Risk, Percentage	45.00%	46.00%	48.00%

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- Definition

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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