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Note 13 - Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net sales	$ 118,722	$ 122,984	$ 334,191	$ 350,837
Gross profit	19,294	25,118	58,352	63,984
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]
Net sales	80,493	83,663	221,294	235,446
Gross profit	10,911	14,196	31,264	32,490
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]
Net sales	38,229	39,321	112,897	115,391
Gross profit	$ 8,383	$ 10,922	$ 27,088	$ 31,494

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