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Note 17 - Discontinued Operations (Details Textual) - USD ($)
12 Months Ended
May 30, 2018
Dec. 31, 2018
Eurodry [Member] | Vessel Acquisition [Member]    
Related Party Transaction, Amounts of Transaction   $ 52,520,000
Eurodry [Member] | Allocated Equity from Accumulated Deficit [Member]    
Related Party Transaction, Amounts of Transaction   9,660,000
Eurodry [Member] | Allocated Equity to Equity [Member]    
Related Party Transaction, Amounts of Transaction   $ 42,860,000
Eurodry [Member]    
Common Stock, Value, Received $ 2,254,830  
Eurodry [Member] | Series B Preferred Stock [Member]    
Preferred Stock, Shares, Received (in shares) 19,042