Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Fair Value Measurements - Other Assets and Liabilities at Fair Value (Details)

v3.10.0.1
Note 7 - Fair Value Measurements - Other Assets and Liabilities at Fair Value (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Fair Value, Inputs, Level 1 [Member] | Anchor Handling Towing Supply [Member]  
Property and equipment
Fair Value, Inputs, Level 1 [Member] | Liftboats [Member]  
Property and equipment
Fair Value, Inputs, Level 2 [Member] | Anchor Handling Towing Supply [Member]  
Property and equipment 2,000
Fair Value, Inputs, Level 2 [Member] | Liftboats [Member]  
Property and equipment
Fair Value, Inputs, Level 3 [Member] | Anchor Handling Towing Supply [Member]  
Property and equipment
Fair Value, Inputs, Level 3 [Member] | Liftboats [Member]  
Property and equipment $ 134,775