Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Equipment Acquisitions and Dispositions (Details Textual)

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Note 2 - Equipment Acquisitions and Dispositions (Details Textual)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Payments to Acquire Property, Plant, and Equipment, Including Fair Value Hedges $ 44.6
Proceeds from Sale of Property, Plant, and Equipment, Including Deposits 4.0
Proceeds from Sale of Property, Plant, and Equipment, Excluding Deposits for Future Vessel Sales 3.9
Proceeds from Deposits 0.1
Gain (Loss) on Disposition of Property Plant Equipment, Total 2.0
Increase (Decrease) in Customer Deposits $ 1.4
Wind Farm Utility Vessel [Member]  
Number of Equipment Acquired 2
Number of Equipment Sold 1
Supply Vessels [Member]  
Number of Equipment Acquired 2
Liftboats [Member]  
Number of Equipment Acquired 6
Anchor Handling Towing Supply [Member]  
Number of Equipment Acquired 2
Number of Equipment Sold 1
Fast Support Vessels Previously Retired [Member]  
Number of Equipment Sold 1
Supply Vessel Previously Retired [Member]  
Number of Equipment Sold 2
Standby Safety Vessels [Member]  
Number of Equipment Sold 2
Fast Support Vessels [Member]  
Number of Equipment Sold 3