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Note 11 - Voyage and Vessel Operating Expenses - Summary of Voyage Expenses in the Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total $ 1,994 $ 3,038 $ 1,020
Total 21,024 22,786 14,826
Voyage Expenses [Member]      
Port charges / other voyage expenses 1 678 1
Bunkers 659 830 18
Commissions (including $511, $829 and $761 respectively, to related party) 1,334 1,530 1,001
Total 1,994 3,038 1,020
Vessel Operating Expenses [Member]      
Crew wages and related costs 14,532 15,771 10,185
Insurance 1,194 1,180 761
Repairs and maintenance (including $187, $247 and $60 respectively, to related party) 1,259 1,528 1,120
Spares and consumable stores 3,861 4,148 2,645
Registration and tonnage taxes (Note 13) $ 178 $ 159 $ 115