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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
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
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) 21,345,900 21,414,374
Common stock, shares outstanding (in shares) 21,329,708 21,398,182
Treasury stock (in shares) 16,192 16,192
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