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Consolidated Balance Sheets (Parentheticals) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, liquidation value 0.001 0.001
Preferred stock, par value (in usd per share) $ 0.01 $ 0.01
Preferred stock, shares designated 825,000 825,000
Preferred stock, shares issued 10,000 10,000
Preferred stock, shares outstanding 10,000 10,000
Common stock, par value (in usd per share) $ 0.001 $ 0.001
Common stock, shares authorized 500,000,000 500,000,000
Common stock, shares issued 59,790,935 19,389,413
Common stock, shares, outstanding 59,779,855 19,378,333
Treasury stock (shares) 11,080 11,080