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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
	Mar. 31, 2024	Mar. 31, 2023
Net sales	$ 113,215	$ 99,097
Gross profit	20,134	16,577
Operating Segments [Member]
Net sales	113,215	99,097
Gross profit	20,134	16,577
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]
Net sales	80,007	63,546
Gross profit	14,242	7,782
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]
Net sales	33,208	35,551
Gross profit	$ 5,892	$ 8,795

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