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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Net sales | $ 130,201 | $ 118,722 | $ 372,921 | $ 334,191
Gross profit | 27,019 | 19,294 | 72,967 | 58,352
Operating Segments [Member] |  |  |  |
Net sales | 130,201 | 118,722 | 372,921 | 334,191
Gross profit | 27,019 | 19,294 | 72,967 | 58,352
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member] |  |  |  |
Net sales | 85,924 | 80,493 | 255,454 | 221,294
Gross profit | 16,628 | 10,911 | 47,851 | 31,264
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member] |  |  |  |
Net sales | 44,277 | 38,229 | 117,467 | 112,897
Gross profit | $ 10,391 | $ 8,383 | $ 25,116 | $ 27,088

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