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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
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) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares issued (in shares) 7,529,625 7,475,768
Common stock, shares outstanding (in shares) 7,500,066 7,446,209
Treasury stock, shares (in shares) 29,559 29,559