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Unaudited Condensed Consolidated Statements of Shareholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2016 10,876,112      
Balance at Dec. 31, 2016 $ 326,283 $ 283,757,739 $ (229,977,258) $ 54,106,764
Net loss attributable to common shareholders (4,111,296) (4,111,296)
Issuance of shares sold at the market (ATM), net of issuance costs (in shares) 301,780      
Issuance of shares sold at the market (ATM), net of issuance costs $ 9,060 377,691 386,751
Share-based compensation and shares canceled, net (in shares) (4,036)      
Share-based compensation and shares canceled, net $ (121) 74,827 74,706
Balance (in shares) at Jun. 30, 2017 11,173,856      
Balance at Jun. 30, 2017 $ 335,222 284,210,257 (234,088,554) 50,456,925
Net loss attributable to common shareholders (4,111,296) (4,111,296)
Balance (in shares) at Dec. 31, 2017 11,274,126      
Balance at Dec. 31, 2017 $ 338,230 284,236,597 (237,880,629) 46,694,198
Net loss attributable to common shareholders (78,883) (78,883)
Share-based compensation and shares canceled, net 96,174 96,174
Balance (in shares) at Jun. 30, 2018 11,274,126      
Balance at Jun. 30, 2018 $ 338,230 231,811,950 (228,302,740) 3,847,440
Net loss attributable to common shareholders (78,883) (78,883)
Spin-off of EuroDry Ltd. to stockholders $ (52,520,821) $ 9,656,772 $ (42,864,049)