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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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net sales	$ 116,372	$ 118,522	$ 215,469	$ 227,853
Gross profit	22,481	24,080	39,058	38,866
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]
Net sales	77,255	77,068	140,801	151,783
Gross profit	12,571	11,105	20,353	18,294
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]
Net sales	39,117	41,454	74,668	76,070
Gross profit	$ 9,910	$ 12,975	$ 18,705	$ 20,572

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