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Note 4 - Revenue Recognition (Details Textual) - Vessel [Member]
$ in Millions
Mar. 31, 2022
USD ($)
Other Current Assets [Member]  
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total $ 1.5
Other Assets [Member]  
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total 3.0
Other Current Liabilities [Member]  
Contract with Customer, Liability, Current $ 1.0