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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2017
Dec. 31, 2016
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 4,000,000 4,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 40,000,000 40,000,000
Common stock, shares issued (in shares) 5,887,899 5,887,899
Common stock, shares outstanding (in shares) 5,723,775 5,708,223
Treasury stock, shares (in shares) 164,124 179,676