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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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net sales	$ 129,505	$ 116,372	$ 242,720	$ 215,469
Gross profit	25,814	22,481	45,948	39,058
Operating Segments [Member]
Net sales	129,505	116,372	242,720	215,469
Gross profit	25,814	22,481	45,948	39,058
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]
Net sales	89,523	77,255	169,530	140,801
Gross profit	16,981	12,571	31,223	20,353
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]
Net sales	39,982	39,117	73,190	74,668
Gross profit	$ 8,833	$ 9,910	$ 14,725	$ 18,705

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