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Note 1 - Basis of Presentation and General Information (Details Textual)
Aug. 22, 2019
Jun. 30, 2019
Reverse Stock Split [Member]    
Stockholders' Equity Note, Stock Split, Conversion Ratio 20  
City of Athens [Member]    
Equity Method Investment, Ownership Percentage   50.00%
Eco Nine [Member]    
Equity Method Investment, Ownership Percentage   50.00%