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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable, allowance for doubtful accounts | $ 3,045 | $ 4,606
Common stock, par value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized (in shares) | 200,000,000 | 100,000,000
Common stock, shares issued (in shares) | 89,298,943 | 88,788,664
Common stock, shares outstanding (in shares) | 82,022,500 | 83,253,588
Treasury stock (in shares) | 7,276,443 | 5,535,076
Common Class A [Member] |  |
Common stock, par value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized (in shares) | 25,000,000 | 25,000,000
Common stock, shares issued (in shares) | 8,569,149 | 8,349,069
Common stock, shares outstanding (in shares) | 6,729,035 | 6,598,377
Treasury stock (in shares) | 1,840,114 | 1,750,692

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