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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019 | Nov. 07, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.03 | $ 0.03 | $ 1 | $ 0.03
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements |  | $ 17,200,000 |  |
Purchase of Vessels [Member] |  |  |  |
Cash Issued Per Vessel Purchased |  |  | $ 500,000 |
Alterwall Business Inc. Vs. Fuel Oil Supplier [Member] | Pending Litigation [Member] | Alterwall Business Inc. [Member] |  |  |  |
Restricted Cash and Investments, Total |  | 530,000 |  |
Estimated Litigation Liability |  | $ 150,000 |  |

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