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Note 17 - Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net sales | $ 102,547 | $ 84,643 | $ 73,812 | $ 72,311 | $ 69,381 | $ 77,632 | $ 69,971 | $ 68,923 | $ 333,313 | $ 285,907 | $ 279,317
Gross profit | 13,578 | 12,363 | 9,538 | 8,775 | 12,363 | 15,619 | 12,958 | 9,579 | 44,254 | 50,519 | 47,184
Depreciation and amortization |  |  |  |  |  |  |  |  | 13,624 | 14,551 | 12,713
Capital expenditures |  |  |  |  |  |  |  |  | 13,262 | 14,013 | 8,585
Total assets | 547,679 |  |  |  | 373,015 |  |  |  | 547,679 | 373,015 |
Engineered Steel Pressure Pipe [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales | 71,579 | 69,439 | 58,748 | 60,057 | 58,086 | 65,077 | 57,649 | 60,878 | 259,823 | 241,690 |
Gross profit | 8,668 | 8,844 | 6,615 | 7,154 | 10,907 | 13,917 | 10,704 | 8,765 | 31,281 | 44,293 |
Precast Infrastructure and Engineered Systems [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales | 30,968 | 15,204 | 15,064 | 12,254 | 11,295 | 12,555 | 12,322 | 8,045 | 73,490 | 44,217 |
Gross profit | 4,910 | $ 3,519 | $ 2,923 | $ 1,621 | 1,456 | $ 1,702 | $ 2,254 | $ 814 | 12,973 | 6,226 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 13,262 | 14,153 | 12,363
Capital expenditures |  |  |  |  |  |  |  |  | 12,793 | 13,428 | 8,033
Total assets | 537,446 |  |  |  | 327,445 |  |  |  | 537,446 | 327,445 |
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 259,823 | 241,690 | 279,317
Gross profit |  |  |  |  |  |  |  |  | 31,281 | 44,293 | 47,184
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,524 | 10,746 | 12,363
Capital expenditures |  |  |  |  |  |  |  |  | 7,538 | 12,031 | 8,033
Total assets | 308,819 |  |  |  | 249,680 |  |  |  | 308,819 | 249,680 |
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 73,490 | 44,217 | 0
Gross profit |  |  |  |  |  |  |  |  | 12,973 | 6,226 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,738 | 3,407 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 5,255 | 1,397 | 0
Total assets | 228,627 |  |  |  | 77,765 |  |  |  | 228,627 | 77,765 |
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 362 | 398 | 350
Capital expenditures |  |  |  |  |  |  |  |  | 469 | 585 | $ 552
Total assets | $ 10,233 |  |  |  | $ 45,570 |  |  |  | $ 10,233 | $ 45,570 |

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