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Note 4 - Revenue Recognition (Details Textual) $ in Millions | Mar. 31, 2021 USD ($)
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Other Current Liabilities [Member] |
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total | $ 1.2
Vessel [Member] | Other Current Assets [Member] |
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total | 2.0
Vessel [Member] | Other Assets [Member] |
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent, Total | $ 4.3

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