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Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
shares in Thousands, $ in Millions
Mar. 31, 2016
Dec. 31, 2015
Accounts receivable, allowance for doubtful accounts $ 0.5 $ 0.4
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000 100,000
Common stock, shares issued (in shares) 22,071 21,868
Common stock, shares outstanding (in shares) 22,071 21,868