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Notes receivable (Details Narrative)
6 Months Ended 12 Months Ended
Jan. 12, 2017
USD ($)
Jul. 15, 2016
USD ($)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 18, 2016
USD ($)
Policyholder Account Balance [Line Items]            
Interest income     $ 639,000 $ 6,172,000 $ 4,408,000  
Deferred Revenue, Current     3,185,000 4,497,000    
Deferred Revenue, Noncurrent     2,185,000 3,312,000    
Proceeds from Sale of Property, Plant, and Equipment     8,183,000 5,978,000 76,264,000  
Financing Receivable, after Allowance for Credit Loss, Current     $ 0 4,726,000    
Sale of MSC Cristina [Member]            
Policyholder Account Balance [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage     6.00%      
Interest income     $ 140,000 424,000    
Gross sale price $ 126,000          
Proceeds from Sale of Property, Plant, and Equipment 107,250,000          
Notes receivable, net $ 18,750,000          
Repayment installments     16      
Debt Instrument, Frequency of Periodic Payment     quarterly      
Financing Receivable, after Allowance for Credit Loss, Current     $ 0      
Notes Receivable, Related Parties, Noncurrent     0      
Interest Receivable     0 38,000    
Hyundai Merchant Marine Co. Ltd. [Member]            
Policyholder Account Balance [Line Items]            
Trading securities           $ 40,277,000
Unsecured Notes           $ 6,074,000
Notes Assumed     8,013,000 7,554,000    
Deferred Revenue, Revenue Recognized     1,130,000 12,121,000 12,102,000  
Deferred Revenue, Current     1,127,000 1,130,000    
Deferred Revenue, Noncurrent     2,185,000 3,312,000    
Hyundai Merchant Marine Co. Ltd. [Member] | Interest Income and Discount Unwinding [Member]            
Policyholder Account Balance [Line Items]            
Interest income     458,000 $ 470,000 $ 420,000  
Hyundai Merchant Marine Co. Ltd. [Member] | 5 Containerships [Member] | Restructuring Agreement [Member]            
Policyholder Account Balance [Line Items]            
Charter Revenue   $ 38,461,000        
Hyundai Merchant Marine Co. Ltd. [Member] | 5 Containerships [Member] | Restructuring Agreement [Member] | Senior Notes [Member]            
Policyholder Account Balance [Line Items]            
Proceeds from Other Debt     $ 7,692,000      
Debt Instrument, Interest Rate, Stated Percentage     3.00%      
Trading securities equity number of shares | shares     3,657      
Hyundai Merchant Marine Co. Ltd. [Member] | 5 Containerships [Member] | Restructuring Agreement [Member] | July 18, 2016 until December 31, 2019            
Policyholder Account Balance [Line Items]            
Charter Revenue     $ 24,400,000      
Effective Date of Arrangements     Jul. 18, 2016      
Related Party Transaction, Date     Dec. 31, 2019      
Hyundai Merchant Marine Co. Ltd. [Member] | 5 Containerships [Member] | Restructuring Agreement [Member] | From January 1, 2020 and thereafter            
Policyholder Account Balance [Line Items]            
Charter Revenue     $ 30,500,000      
Effective Date of Arrangements     Jan. 01, 2020