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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Jun. 30, 2022
Dec. 31, 2021
Preferred stock, par value (in dollars per share) $ 0.01  
Preferred stock, shares authorized (in shares) 47,000,000 47,000,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares issued (in shares) 21,771,401 21,320,414
Treasury stock, shares (in shares) 128,342 54,329
Series A Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 0 3,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Series B Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 2,000,000 0
Preferred stock, shares issued (in shares) 1,650,000 0
Preferred stock, shares outstanding (in shares) 1,650,000 0