Quarterly report pursuant to Section 13 or 15(d)

Consolidated Condensed Statements of Stockholders' Equity (Unaudited) (Parentheticals)

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Consolidated Condensed Statements of Stockholders' Equity (Unaudited) (Parentheticals)
Mar. 31, 2021
$ / shares
Common Stock [Member] | January 2021 Offering [Member]  
Stock issued, price per share (in dollars per share) $ 2.60
Common Stock [Member] | February 2021 Offering [Member]  
Stock issued, price per share (in dollars per share) 4.10
Common Stock [Member] | March 2021 Offering [Member]  
Stock issued, price per share (in dollars per share) 9.00
Additional Paid-in Capital [Member] | January 2021 Offering [Member]  
Stock issued, price per share (in dollars per share) 2.60
Additional Paid-in Capital [Member] | February 2021 Offering [Member]  
Stock issued, price per share (in dollars per share) 4.10
Additional Paid-in Capital [Member] | March 2021 Offering [Member]  
Stock issued, price per share (in dollars per share) 9.00
March 2021 Offering [Member]  
Stock issued, price per share (in dollars per share) $ 9.00