Quarterly report pursuant to Section 13 or 15(d)

Note 16 - Subsequent Event (Details Textual)

v3.10.0.1
Note 16 - Subsequent Event (Details Textual)
1 Months Ended 9 Months Ended
Nov. 08, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Oct. 31, 2018
Sep. 26, 2018
USD ($)
Jul. 05, 2018
USD ($)
Proceeds from Sale of Property, Plant, and Equipment, Total   $ 5,384,000 $ 9,797,000      
Repayments of Long-term Debt, Total   $ 38,053,000 $ 8,572,000      
Fast Support Vessels [Member]            
Number of Equipment Sold   3        
Term Loan to Acquire Two Vessels [Member]            
Debt Instrument, Face Amount           $ 11,000,000
Loan Facility With DNB Bank ASA [Member]            
Debt Instrument, Face Amount         $ 130,000,000  
Subsequent Event [Member]            
Proceeds from Sale of Property, Plant, and Equipment, Total $ 8,200,000          
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property 5,100,000          
Repayments of Long-term Debt, Total $ 7,000,000          
Subsequent Event [Member] | Fast Support Vessels [Member]            
Number of Equipment Sold 3          
Subsequent Event [Member] | Liftboats [Member]            
Number of Equipment Sold 2          
Subsequent Event [Member] | Debt With Seacor 88 and Seacor 888 [Member]            
Percentage of Debt Hedged by Interest Rate Derivatives       50.00%    
Subsequent Event [Member] | Loan Facility With DNB Bank ASA [Member]            
Percentage of Debt Hedged by Interest Rate Derivatives       50.00%