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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Cost of Property Repairs and Maintenance                 $ 9,300 $ 19,300 $ 31,600
Number of Countries in which Entity Operates 40               40    
Probability of Uncertainty of Income Tax Return                 50.00%    
Foreign Currency Transaction Loss, before Tax                 $ 2,300 1,200 2,000
Marine Services Revenue $ 26,617 $ 27,821 $ 30,487 $ 38,794 $ 50,585 $ 60,668 $ 74,461 $ 89,092 $ 123,719 274,806 $ 495,769
Percentage of Fair Market Value of Common Stock at Which Common Stock Shares Acquired                 85.00%    
Sum of Percentage of Share of Non Vested Stock                 15.00%    
Percentage of Share of Non Vested Stock Considered as Call Option                 85.00%    
Percentage of Share of Non Vested Stock Considered as Put Option                 15.00%    
Allowance for Doubtful Accounts Receivable, Write-offs                   0  
Forward Contracts [Member]                      
Derivative, Fair Value, Net $ 0       $ 0       $ 0 $ 0  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                      
Number of Major Customers                 0    
Concentration Risk, Percentage                   23.50% 28.20%
North Sea [Member]                      
Provision for Doubtful Accounts                     $ 3,200
Number of Major Customers                     2
Marine Services Revenue                 $ 76,759 $ 142,168 $ 225,253
North Sea [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                      
Number of Major Customers                   1 1
North Sea [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member]                      
Marine Services Revenue                   $ 32,400 $ 88,700
Southeast Asia Segment [Member]                      
Provision for Doubtful Accounts                 $ 1,800    
Number of Major Customers                 3    
Americas [Member]                      
Marine Services Revenue                 $ 32,891 $ 97,114 $ 205,763
Americas [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                      
Number of Major Customers                   1 1
Americas [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member]                      
Marine Services Revenue                   $ 31,900 $ 50,000
All Vessels Other than Crew Boats [Member]                      
Property, Plant and Equipment, Useful Life                   25 years  
Crew Boats [Member]                      
Property, Plant and Equipment, Useful Life                   20 years  
Vessel [Member]                      
Interest Costs Capitalized                 $ 2,600 $ 5,000 $ 8,400
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    
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