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Note 12 - Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net sales	$ 109,331	$ 72,311
Gross profit	14,786	8,775
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]
Net sales	74,715	60,057
Gross profit	7,189	7,154
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]
Net sales	34,616	12,254
Gross profit	$ 7,597	$ 1,621

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