Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Discount of note payable	$ 0	$ 244,830
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares outstanding (in shares)	65,335,159	19,804,787
Series B Convertible Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	2,300,000	2,300,000
Preferred stock, shares outstanding (in shares)	79,246	79,246