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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Sep. 30, 2018
Dec. 31, 2017
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) 21,414,374 21,438,269
Common stock, shares outstanding (in shares) 21,398,182 21,422,077
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