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Note 1 - Basis of Presentation and General Information (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Feb. 28, 2018
Sep. 29, 2017
Apr. 06, 2017
Jun. 30, 2018
Mar. 31, 2017
Cash         $ 10,840
Restricted Cash and Cash Equivalents         7,570
Working Capital Surplus         170
Commitments and Vessel Sales, Draw-down Capacity         4,000
Kamsarmax Newbuilding Vessel [Member]          
Accounts Payable         $ 22,500
Kamsarmax Newbuilding Vessel [Member] | Scenario, Forecast [Member]          
Payments to Acquire Property, Plant, and Equipment $ 2,250 $ 2,250   $ 15,750  
Kamsarmax Newbuilding Vessel [Member] | Subsequent Event [Member]          
Payments to Acquire Property, Plant, and Equipment     $ 2,250    
Friends Investment Company Inc. [Member]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         29.10%