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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net sales | $ 457,665 | $ 333,313 | $ 285,907
Gross profit | 85,855 | 44,254 | 50,519
Depreciation and amortization | 17,103 | 13,624 | 14,551
Capital expenditures | 22,829 | 13,262 | 14,013
Total assets | 601,340 | 547,679 |
Operating Segments [Member] |  |  |
Depreciation and amortization | 16,596 | 13,262 | 14,153
Capital expenditures | 22,136 | 12,793 | 13,428
Total assets | 564,444 | 537,446 |
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member] |  |  |
Net sales | 307,572 | 259,823 | 241,690
Gross profit | 44,473 | 31,281 | 44,293
Depreciation and amortization | 9,789 | 9,524 | 10,746
Capital expenditures | 8,211 | 7,538 | 12,031
Total assets | 307,924 | 308,819 |
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member] |  |  |
Net sales | 150,093 | 73,490 | 44,217
Gross profit | 41,382 | 12,973 | 6,226
Depreciation and amortization | 6,807 | 3,738 | 3,407
Capital expenditures | 13,925 | 5,255 | 1,397
Total assets | 256,520 | 228,627 |
Corporate, Non-Segment [Member] |  |  |
Depreciation and amortization | 507 | 362 | 398
Capital expenditures | 693 | 469 | $ 585
Total assets | $ 36,896 | $ 10,233 |

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