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Revenues Revenues, Text details (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
vessel
Disaggregation of Revenue [Line Items]  
Number of vessels on long-term contracts | vessel 3
Period after charter, available to purchase 7 years
Purchase price $ 39,000
Purchase price commission 1.00%
Annual decrease in purchase price $ 1,500
Minimum  
Disaggregation of Revenue [Line Items]  
Term of charter contract 1 month
Term of charter contract, long-term 10 years
Remaining term of charter contracts 2 years
Charter contract renewal term 1 month
Maximum  
Disaggregation of Revenue [Line Items]  
Term of charter contract 6 months
Term of charter contract, long-term 20 years
Remaining term of charter contracts 12 years
Charter contract renewal term 12 months