Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Long-term Debt (Details Textual)

v3.10.0.1
Note 4 - Long-term Debt (Details Textual)
$ / shares in Units, $ in Thousands, € in Millions
6 Months Ended
May 02, 2018
USD ($)
$ / shares
shares
Feb. 08, 2018
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
Jun. 30, 2018
EUR (€)
Jun. 30, 2017
USD ($)
May 31, 2018
$ / shares
May 24, 2018
$ / shares
Dec. 31, 2017
$ / shares
Dec. 01, 2015
USD ($)
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 0.01          
Repayments of Long-term Debt, Total     $ 35,202   $ 3,973        
Debt Instrument, Increase (Decrease), Net, Total     1,000            
Other Labor and Performance Guarantee     1,700            
Long-term Debt Obligation [Member]                  
Letters of Credit Outstanding, Amount     $ 7,900            
Falcon Global Holdings [Member]                  
Noncontrolling Interest, Ownership Percentage by Parent     72.00%            
Falcon Global USA LLC [Member]                  
Payments for Debtor-in-possession Obligations   $ 15,000              
Convertible Senior Notes Converted to Warrants [Member] | Carlyle Group [Member]                  
Debt Instrument, Convertible, Conversion Ratio 37.73                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 0.01                
Debt Conversion, Original Debt, Amount $ 50,000                
Debt Conversion, Converted Instrument, Shares Issued | shares 1,886,792                
Debt Instrument, Convertible, Conversion Price | $ / shares $ 26.50                
Conversion Revolving Credit Facility from Windcat Workboats [Member]                  
Debt Conversion, Original Debt, Amount | €       € 6          
Carlyle Warrants [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 0.01     $ 0.01 $ 0.01    
Warrants and Rights Outstanding, Term 25 years                
Convertible Senior Notes 3.75% [Member]                  
Convertible Debt, Total $ 125,000               $ 175,000
Debt Instrument, Interest Rate, Stated Percentage 4.25%               3.75%
Debt Instrument, Convertible, Conversion Ratio     23.26 23.26          
FGUSA Credit Facility [Member]                  
Debt Agreement, Maximum Borrowing Capacity   131,100              
Debt Instrument, Unamortized Discount, Total   10,000              
FGUSA Credit Facility [Member] | Revolving Credit Facility [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity   15,000              
Debt Instrument, Interest Rate, Effective Percentage     6.63%            
Proceeds from Lines of Credit, Total     $ 10,000            
FGUSA Credit Facility [Member] | Term Loan [Member]                  
Long-term Debt, Total   $ 116,100              
Euro Debt [Member]                  
Repayments of Long-term Debt, Total     7,500            
Pound Sterling Debt [Member]                  
Proceeds from Issuance of Long-term Debt, Total     $ 8,500