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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Nov. 14, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Nov. 14, 2017
USD ($)
Dec. 31, 2018
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Cost of Property Repairs and Maintenance   $ 1,500                          
Number of Countries in which Entity Operates   40 40                   40    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00%                     35.00%    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability     $ (15,200)                   $ (15,200)    
Probability of Uncertainty of Income Tax Return                         50.00%    
Foreign Currency Transaction Loss, before Tax   $ 100                          
Marine Services Revenue   13,593                          
Percentage of Fair Market Value of Common Stock at Which Common Stock Shares Acquired                         85.00%    
Allowance for Doubtful Accounts Receivable, Write-offs   0                          
Forward Contracts [Member]                              
Derivative, Fair Value, Net   $ 0 $ 0                   $ 0    
Noteholder Warrants [Member]                              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 0.01 $ 0.01                   $ 0.01    
Equity Warrants [Member]                              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 100 $ 100                   $ 100    
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                              
Number of Major Customers   0                          
Americas [Member]                              
Marine Services Revenue   $ 3,921                          
North Sea [Member]                              
Marine Services Revenue   $ 8,304                          
Predecessor [Member]                              
Cost of Property Repairs and Maintenance                     $ 9,000     $ 9,300 $ 19,300
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                     35.00%     35.00% 35.00%
Foreign Currency Transaction Loss, before Tax                     $ 300     $ 2,400 $ 1,100
Marine Services Revenue $ 13,424     $ 25,805 $ 24,641 $ 24,359 $ 26,617 $ 27,821 $ 30,487 $ 38,794 88,229     123,719 $ 274,806
Predecessor [Member] | Forward Contracts [Member]                              
Derivative, Fair Value, Net             $ 0             $ 0  
Predecessor [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                              
Number of Major Customers                           0  
Concentration Risk, Percentage                             23.50%
Predecessor [Member] | Southeast Asia and Americas [Member]                              
Provision for Doubtful Accounts                     1,000        
Predecessor [Member] | Americas [Member]                              
Marine Services Revenue                     $ 27,406     $ 32,891 $ 97,114
Predecessor [Member] | Americas [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                              
Number of Major Customers                     1       1
Concentration Risk, Percentage                     10.20%        
Predecessor [Member] | Americas [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member]                              
Marine Services Revenue                     $ 9,000       $ 31,900
Predecessor [Member] | Southeast Asia Segment [Member]                              
Provision for Doubtful Accounts                           $ 1,800  
Number of Major Customers                           3  
Predecessor [Member] | North Sea [Member]                              
Marine Services Revenue                     $ 52,217     $ 76,759 $ 142,168
Predecessor [Member] | North Sea [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                              
Number of Major Customers                             1
Predecessor [Member] | North Sea [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member]                              
Marine Services Revenue                             $ 32,400
Scenario, Forecast [Member]                              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                       21.00%      
Vessel [Member]                              
Property, Plant and Equipment, Useful Life   20 years                          
Property, Plant and Equipment, Salvage Value, Percentage   5.00% 5.00%                   5.00%    
Interest Costs Capitalized   $ 0                          
Vessel [Member] | Predecessor [Member]                              
Property, Plant and Equipment, Useful Life                     25 years        
Property, Plant and Equipment, Salvage Value, Percentage 15.00%                   15.00%        
Interest Costs Capitalized                     $ 100     $ 2,600 $ 5,000
Office Equipment [Member] | Minimum [Member]                              
Property, Plant and Equipment, Useful Life                         2 years    
Office Equipment [Member] | Maximum [Member]                              
Property, Plant and Equipment, Useful Life                         5 years    
Drydock [Member]                              
Property, Plant and Equipment, Useful Life   2 years 180 days                          
Furniture and Fixtures [Member] | Minimum [Member]                              
Property, Plant and Equipment, Useful Life                         2 years    
Furniture and Fixtures [Member] | Maximum [Member]                              
Property, Plant and Equipment, Useful Life                         5 years    
Vehicles [Member] | Minimum [Member]                              
Property, Plant and Equipment, Useful Life                         2 years    
Vehicles [Member] | Maximum [Member]                              
Property, Plant and Equipment, Useful Life                         5 years