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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
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) 28,000,000 28,000,000
Common stock, shares issued (in shares) 19,753,170 18,802,679