Annual report pursuant to Section 13 and 15(d)

Note 14 - Savings and Multi-employer Pension Plans (Details Textual)

v3.19.1
Note 14 - Savings and Multi-employer Pension Plans (Details Textual)
$ in Thousands, € in Millions, £ in Millions
3 Months Ended 12 Months Ended
Jan. 01, 2019
Jun. 30, 2018
USD ($)
Jun. 30, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Nov. 07, 2018
GBP (£)
Dec. 31, 2015
USD ($)
Other Defined Contribution Plan [Member]                  
Defined Contribution Plan, Cost       $ 700 $ 700 $ 700      
United Kingdom Merchant Navy Officers Pension Fund [Member] | Foreign Pension Plan [Member]                  
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total             $ 19,400    
Merchant Navy Ratings Pension Fund [Member]                  
Liability, Defined Benefit Pension Plan, Current       400          
Multiemployer Plan, Contributions by Employer   $ 1,190 € 0.9            
Merchant Navy Ratings Pension Fund [Member] | Foreign Pension Plan [Member]                  
Pension and Other Post-retirement Benefit Plans, Total Funding Deficit               £ 9 $ 6,900
Liability, Defined Benefit Pension Plan, Current       1,500          
Liability, Defined Benefit Pension Plan, Noncurrent       $ 1,900          
Subsequent Event [Member]                  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 1.00%