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Operating Segments - Summarized Segment Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | $ 24,268 | $ 31,988 | $ 48,053 | $ 69,667 |
Gross profit (loss) | 1,104 | (728) | 1,025 | (1,196) |
Operating income (loss) | (1,609) | (4,099) | (3,946) | 2,156 |
Capital expenditures |  |  | 921 | 7,745 |
Total assets | 143,679 |  | 143,679 |  | $ 231,343
Operating Segments | F&S |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 21,227 | 26,606 | 40,287 | 60,049 |
Operating Segments | Shipyard |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 3,129 | 5,902 | 8,259 | 10,585 |
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | (88) | (520) | (493) | (967) |
Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 24,268 | 31,988 | 48,053 | 69,667 |
Gross profit (loss) | 1,104 | (728) | 1,025 | (1,196) |
Operating income (loss) | (1,609) | (4,099) | (3,946) | 2,156 |
Depreciation and amortization expense | 1,082 | 1,232 | 2,149 | 2,632 |
Capital expenditures | 419 | 1,322 | 579 | 2,003 |
Total assets | 143,677 | 160,811 | 143,677 | 160,811 |
Continuing Operations | Operating Segments | F&S |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 21,227 | 26,606 | 40,287 | 60,049 |
Gross profit (loss) | 2,241 | (492) | 3,228 | 446 |
Operating income (loss) | 1,656 | (1,484) | 2,517 | 8,579 |
Depreciation and amortization expense | 1,001 | 1,155 | 1,989 | 2,480 |
Capital expenditures | 226 | 1,143 | 386 | 1,824 |
Total assets | 47,199 | 71,509 | 47,199 | 71,509 |
Continuing Operations | Operating Segments | Shipyard |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 3,129 | 5,902 | 8,259 | 10,585 |
Gross profit (loss) | (1,059) | (183) | (2,037) | (1,524) |
Operating income (loss) | (1,119) | (422) | (2,370) | (2,089) |
Capital expenditures | 193 |  | 193 |  |
Total assets | 17,524 | 16,632 | 17,524 | 16,632 |
Continuing Operations | Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | (88) | (520) | (493) | (967) |
Gross profit (loss) | (78) | (53) | (166) | (118) |
Operating income (loss) | (2,146) | (2,193) | (4,093) | (4,334) |
Depreciation and amortization expense | 81 | 77 | 160 | 152 |
Capital expenditures |  | 179 |  | 179 |
Total assets | $ 78,954 | $ 72,670 | $ 78,954 | $ 72,670 |

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