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Note 19 - Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net sales |  | $ 492,548 | $ 444,355 | $ 457,665
Cost of sales |  | 397,143 | 366,713 | 371,810
Gross profit |  | 95,405 | 77,642 | 85,855
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member] |  |  |  |
Net sales |  | 337,945 | 296,381 | 307,572
Cost of sales | [1] | 275,341 | 253,954 | 263,099
Gross profit |  | 62,604 | 42,427 | 44,473
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member] |  |  |  |
Net sales |  | 154,603 | 147,974 | 150,093
Cost of sales | [2] | 121,802 | 112,759 | 108,711
Gross profit |  | $ 32,801 | $ 35,215 | $ 41,382
[1] | Depreciation and amortization included in Cost of sales for the SPP segment for the years ended December 31, 2024, 2023, and 2022 was $13.2 million, $9.0 million, and $9.8 million, respectively.
[2] | Depreciation and amortization included in Cost of sales for the Precast segment for the years ended December 31, 2024, 2023, and 2022 was $5.1 million, $6.2 million, and $6.8 million, respectively.

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