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Note 1 - Basis of Presentation and General Information (Details Textual) | Aug. 22, 2019 | Jun. 30, 2019
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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%

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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