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Note 11 - Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net sales	$ 99,097	$ 109,331
Gross profit	16,577	14,786
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]
Net sales	63,546	74,715
Gross profit	7,782	7,189
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]
Net sales	35,551	34,616
Gross profit	$ 8,795	$ 7,597

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