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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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net sales	$ 130,201	$ 118,722	$ 372,921	$ 334,191
Gross profit	27,019	19,294	72,967	58,352
Operating Segments [Member]
Net sales	130,201	118,722	372,921	334,191
Gross profit	27,019	19,294	72,967	58,352
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]
Net sales	85,924	80,493	255,454	221,294
Gross profit	16,628	10,911	47,851	31,264
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]
Net sales	44,277	38,229	117,467	112,897
Gross profit	$ 10,391	$ 8,383	$ 25,116	$ 27,088

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