| QUARTERLY OPERATING RESULTS (UNAUDITED) | 11. QUARTERLY OPERATING RESULTS (UNAUDITED) The following table presents selected unaudited consolidated financial information on a quarterly basis for 2020 and 2019 (in thousands, except per share data):   
|   |   | March 31, 2020 |   |   | June 30, 2020 |   |   | September 30, 2020 |   |   | December 31, 2020 (1) |   |  
| Revenue |   | $ | 78,555 |   |   | $ | 59,974 |   |   | $ | 54,869 |   |   | $ | 57,561 |   |  
| Gross loss |   |   | (254 | ) |   |   | (1,703 | ) |   |   | (7,817 | ) |   |   | (7,977 | ) |  
| Net income (loss) |   |   | 5,905 |   |   |   | (5,537 | ) |   |   | (12,337 | ) |   |   | (15,406 | ) |  
| Basic and diluted income (loss) per share |   |   | 0.39 |   |   |   | (0.36 | ) |   |   | (0.81 | ) |   |   | (1.01 | ) |    
|   |   | March 31, 2019 |   |   | June 30, 2019 |   |   | September 30, 2019 |   |   | December 31, 2019 (2) |   |  
| Revenue |   | $ | 67,605 |   |   | $ | 80,456 |   |   | $ | 75,802 |   |   | $ | 79,445 |   |  
| Gross profit (loss) |   |   | 553 |   |   |   | (1,598 | ) |   |   | (2,685 | ) |   |   | (13,269 | ) |  
| Net loss |   |   | (3,042 | ) |   |   | (5,248 | ) |   |   | (6,779 | ) |   |   | (34,325 | ) |  
| Basic and diluted loss per share |   |   | (0.20 | ) |   |   | (0.34 | ) |   |   | (0.44 | ) |   |   | (2.26 | ) |    
|   | (1) | Gross loss and net loss for the fourth quarter 2020 includes project charges of $8.8 million for our Shipyard Division.  Net loss for the fourth quarter 2020 also includes impairment charges and net losses on the sales of assets held for sale of $1.6 million and $2.4 million for our Shipyard Division and F&S Division, respectively.  The fourth quarter 2020 was also impacted by the under-recovery of overhead costs for our F&S Division, and to a lesser extent, our Shipyard Division. See Note 2 for further discussion of our project impacts and Note 3 for further discussion of our impairments. |  
|   | (2) | Gross loss and net loss for the fourth quarter 2019 includes project charges of $10.2 million and $3.8 million for our Shipyard Division and F&S Division, respectively. Net loss for the fourth quarter 2019 also includes impairment charges of $7.6 million, $9.0 million and $0.7 million for our Shipyard Division, F&S Division and Corporate Division, respectively.  The fourth quarter 2019 was also impacted by the under-recovery of overhead costs for our F&S Division, and to a lesser extent, our Shipyard Division. See Note 2 for further discussion of our project impacts and Note 3 for further discussion of our impairments.      |  |