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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ / shares in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts receivable, allowance for doubtful accounts $ 168,409 $ 164,145
Preferred stock, no par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 1,250,000 1,250,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 250,000,000 250,000,000
Common stock, shares issued (in shares) 10,583,879 10,461,574
Common stock, shares outstanding (in shares) 10,583,879 10,461,574