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Note 15 - 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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net sales	$ 122,984	$ 84,643	$ 350,837	$ 230,766
Gross profit	25,118	12,363	63,984	30,676
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]
Net sales	83,663	69,439	235,446	188,244
Gross profit	14,196	8,844	32,490	22,613
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]
Net sales	39,321	15,204	115,391	42,522
Gross profit	$ 10,922	$ 3,519	$ 31,494	$ 8,063

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