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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Preferred stock, shares authorized (in shares) 1,000,000  
Series D Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 920,000 0
Preferred stock, shares outstanding (in shares) 920,000 0
Preferred stock, liquidation preference (in dollars per share) $ 25.00 $ 25.00
Common Class A [Member]    
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 issued (in shares) 11,490,230 9,508,363
Common stock, shares outstanding (in shares) 11,490,230 9,508,363