Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Noncontrolling Interests in Subsidiaries (Details Textual)

v3.10.0.1
Note 10 - Noncontrolling Interests in Subsidiaries (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 08, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total   $ (26,629) $ (36,489) $ (58,317) $ (44,088)
Net Income (Loss) Attributable to Noncontrolling Interest, Total   $ (1,605) $ (2,497) $ (4,460) $ (2,701)
Windcat Workboats [Member]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   12.50%   12.50%  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total       $ (3,300)  
Net Income (Loss) Attributable to Noncontrolling Interest, Total       (400)  
Net Assets, Ending Balance   $ 17,600   17,600  
Falcon Global Holdings [Member]          
Joint Venture, Total Capital $ 112,500        
Joint Venture, Contribution from Previous Joint Venture 43,300        
Joint Venture, Contribution from Noncontrolling Interest $ 18,800        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 28.00%        
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total       14,400  
Net Income (Loss) Attributable to Noncontrolling Interest, Total       $ 4,000