Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Commitments and Contingencies (Details Textual)

v3.10.0.1
Note 11 - Commitments and Contingencies (Details Textual)
€ in Millions, $ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Unrecorded Unconditional Purchase Obligation, Total $ 34.5  
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year 2.7  
Unrecorded Unconditional Purchase Obligation, Due within Two Years 17.3  
Unrecorded Unconditional Purchase Obligation, Due within Three Years 14.5  
Unrecorded Unconditional Purchase Obligation, Due within Four Years 20.8  
Guarantor Obligations, Maximum Exposure, Undiscounted $ 46.1  
SEACOR Holdings [Member]    
Related Party Transaction, Rate 0.50%  
Line of Credit [Member] | Performance Guarantee [Member]    
Guarantor Obligations, Maximum Exposure, Undiscounted | €   € 0.9
SeaCosco Offshore LLC [Member]    
Unrecorded Unconditional Purchase Obligation, Total $ 5.3  
Fast Support Vessels [Member]    
Unrecorded Unconditional Purchase Obligation, Maximum Quantity 2 2
Supply Vessels [Member]    
Unrecorded Unconditional Purchase Obligation, Maximum Quantity 3 3
Wind Farm Utility Vessel [Member]    
Unrecorded Unconditional Purchase Obligation, Maximum Quantity 2 2
Standby Safety Vessels [Member]    
Unrecorded Unconditional Purchase Obligation, Maximum Quantity 1 1