Annual report pursuant to Section 13 and 15(d)

Note 13 - Noncontrolling Interests in Subsidiaries (Details Textual)

v3.19.1
Note 13 - Noncontrolling Interests in Subsidiaries (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 08, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 28, 2017
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total   $ (31,688) $ (26,629) $ (15,766) $ (7,969) $ (7,599) $ (36,489) $ (22,356) $ 27,904 $ (82,052) $ (38,540) $ (133,150)  
Net Income (Loss) Attributable to Noncontrolling Interest, Total                   (4,444) $ (5,639) (1,103)  
Windcat Workboats [Member]                          
Business Acquisition, Percentage of Voting Interests Acquired           12.50%         12.50%    
Payments to Acquire Businesses, Gross                     $ 3,700    
Falcon Global Holdings [Member]                          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 72.00%                        
Business Acquisition, Percentage of Voting Interests Acquired                         100.00%
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                        
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total $ 14,300                        
Net Income (Loss) Attributable to Noncontrolling Interest, Total                   4,000      
Net Assets, Ending Balance   98,100               98,100      
Windcat Workboats [Member]                          
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total                   (3,100) (2,100) (4,500)  
Net Income (Loss) Attributable to Noncontrolling Interest, Total                   (400) (400) $ (1,100)  
Net Assets, Ending Balance   $ 16,900       $ 21,100       $ 16,900 $ 21,100