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Note 15 - Segment Reporting - Segment Reporting (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Revenues from external customers |  |  |  |  |  |  |  |  | $ 198,496 | $ 178,220
Revenue from Contract with Customer, Including Assessed Tax | $ 40,322 | $ 54,614 | $ 54,926 | $ 48,634 | $ 49,253 | $ 46,138 | $ 41,169 | $ 41,660 | 198,496 | 178,220
Operating profit (loss) | (1,818) | $ (475) | $ 1,035 | $ 1,680 | (1,399) | $ (258) | $ (206) | $ (494) | 422 | (2,357)
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,279 | 7,497
Capital expenditures |  |  |  |  |  |  |  |  | 1,547 | 1,844
Total assets | 119,682 |  |  |  | 122,866 |  |  |  | 119,682 | 122,866
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | (137) | (7)
Operating profit (loss) |  |  |  |  |  |  |  |  | (8) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |
Total assets | (194,747) |  |  |  | (214,110) |  |  |  | (194,747) | (214,110)
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  |
Heavy Fabrications [Member] |  |  |  |  |  |  |  |  |  |
Total assets | 40,438 |  |  |  | 41,432 |  |  |  | 40,438 | 41,432
Heavy Fabrications [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 155,096 | 128,686
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 155,198 | 128,686
Operating profit (loss) |  |  |  |  |  |  |  |  | 10,385 | 1,861
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,736 | 3,976
Capital expenditures |  |  |  |  |  |  |  |  | 1,049 | 992
Heavy Fabrications [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 102 |
Gearing [Member] |  |  |  |  |  |  |  |  |  |
Total assets | 43,319 |  |  |  | 47,022 |  |  |  | 43,319 | 47,022
Gearing [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 25,104 | 34,877
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 25,136 | 34,877
Operating profit (loss) |  |  |  |  |  |  |  |  | (3,883) | 3,237
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,961 | 1,981
Capital expenditures |  |  |  |  |  |  |  |  | 283 | 769
Gearing [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 32 |
Industrial Solutions [Member] |  |  |  |  |  |  |  |  |  |
Total assets | 10,244 |  |  |  | 8,893 |  |  |  | 10,244 | 8,893
Industrial Solutions [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 18,296 | 14,657
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 18,299 | 14,664
Operating profit (loss) |  |  |  |  |  |  |  |  | 881 | (1,059)
Depreciation and amortization |  |  |  |  |  |  |  |  | 430 | 1,362
Capital expenditures |  |  |  |  |  |  |  |  | 159 | 52
Industrial Solutions [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 3 | 7
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |
Total assets | $ 220,428 |  |  |  | $ 239,629 |  |  |  | 220,428 | 239,629
Corporate Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  | (6,953) | (6,396)
Depreciation and amortization |  |  |  |  |  |  |  |  | 152 | 178
Capital expenditures |  |  |  |  |  |  |  |  | 56 | 31
Corporate Segment [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  |

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- Definition Amount of revenue from external customers for the reportable segment. Such disclosure is presented if the amount is: (a) included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References No definition available. + Details
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