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Note 6 - Other Operating Income (Details Textual) - M/V EM Oinousses [Member] - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended
Jan. 31, 2020
Sep. 30, 2020
Vessel Evaluation, Unrepaired Damage Claim $ 2.7  
Vessel Evaluation, Damage Repair Paid   $ 2.2
Vessel Evaluation, Receivable   0.8
Vessel Evaluation, General Average Claim   0.3
Other Operating Income [Member]    
Vessel Evaluation, Other Operating Income   $ 2.7