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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