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Note 18 - Revenues - Revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues $ 60,222 $ 66,088 $ 41,048
Time Charter Contracts [Member]      
Revenues 60,222 61,695 39,442
Time Charter - Related Parties [Member]      
Revenues 0 1,311 1,606
Voyage Charter [Member]      
Revenues $ 0 $ 3,082 $ 0