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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net sales	$ 118,522	$ 73,812	$ 227,853	$ 146,123
Gross profit	24,080	9,538	38,866	18,313
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]
Net sales	77,068	58,748	151,783	118,805
Gross profit	11,105	6,615	18,294	13,769
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]
Net sales	41,454	15,064	76,070	27,318
Gross profit	$ 12,975	$ 2,923	$ 20,572	$ 4,544

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