Annual report pursuant to Section 13 and 15(d)

Note 20 - Subsequent Events (Details Textual)

v3.19.1
Note 20 - Subsequent Events (Details Textual)
11 Months Ended 12 Months Ended
Jan. 25, 2019
USD ($)
Jan. 25, 2019
GBP (£)
Jan. 09, 2019
shares
Dec. 31, 2019
Dec. 31, 2018
[1]
Dec. 31, 2017
Dec. 31, 2016
Number of Equipment Acquired         8 11 17
Windcat Workboats [Member]              
Business Acquisition, Percentage of Voting Interests Acquired           12.50%  
Seabulk Overseas [Member] | Scenario, Forecast [Member] | Windcat Workboats [Member]              
Ownership Percentage       100.00%      
Seabulk Overseas [Member] | Windcat Workboats [Member] | Scenario, Forecast [Member]              
Business Acquisition, Percentage of Voting Interests Acquired       6.25%      
Number of Acquisition Transactions       2      
Fast Support Vessels [Member]              
Number of Equipment Acquired         6 12
Subsequent Event [Member] | Seabulk Overseas [Member] | Windcat Workboats [Member]              
Ownership Percentage 100.00% 100.00%          
Subsequent Event [Member] | Seabulk Overseas [Member] | Windcat Workboats [Member]              
Business Acquisition, Percentage of Voting Interests Acquired 6.25% 6.25%          
Business Combination, Consideration Transferred, Total $ 2,000,000 £ 1,552,780          
Subsequent Event [Member] | Fast Support Vessels [Member] | Domestic U.S. Holders Affiliated With The McCall Family of Louisiana [Member]              
Number of Equipment Acquired     3        
Subsequent Event [Member] | Fast Support Vessels [Member] | Domestic U.S. Holders Affiliated With The McCall Family of Louisiana [Member] | Revenue Sharing Pooling Agreement [Member]              
Acquired Vessels Prior Operation Period     10 years        
Number of Vessels     4        
Subsequent Event [Member] | Fast Support Vessels [Member] | Domestic U.S. Holders Affiliated With The McCall Family of Louisiana [Member] | Private Placement [Member]              
Stock Issued During Period, Shares, Purchase of Assets     603,872        
[1] Excludes two AHTS vessels purchased from Managed Entity Seacor 88 and Seacor 888, and one crew transfer vessel purchased from the Company's joint venture FRS Windcat Offshore Logistics.