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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2021
Dec. 31, 2020
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 975,150 975,150
Preferred stock, shares issued (in shares) 0 0
Treasury stock (in shares) 19 1,236
Series A Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 24,850 24,850
Preferred stock, shares issued (in shares) 0 0
Nonvoting Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, shares issued (in shares) 0 0
Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 30,000,000 30,000,000
Common stock, shares issued (in shares) 21,864,743 21,302,194
Common stock, shares outstanding (in shares) 21,864,724 21,300,958