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Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 0.6 $ 0.4
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 22,229,000 21,868,000
Common stock, shares outstanding (in shares) 22,229,000 21,868,000