Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)

v3.23.1
Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2023
Dec. 31, 2022
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common Stock, Shares, Issued (in shares) 32,851,252 32,687,666
Common stock, shares outstanding (in shares) 32,851,252 32,687,666
Non-Series Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, shares issued (in shares) 0 0
Series D Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 150,000 150,000
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, shares issued (in shares) 0 0
Series E Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 50,000 50,000
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, shares issued (in shares) 0 0
Series G Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 3,260 3,260
Preferred stock, shares outstanding (in shares) 3,260 3,260
Preferred stock, shares issued (in shares) 3,260 3,260
Series H Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 75,000 75,000
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, shares issued (in shares) 0 0
Series I Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 35,000 35,000
Preferred stock, shares outstanding (in shares) 9,480 9,480
Preferred stock, shares issued (in shares) 9,480 9,480