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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue Recognition [Abstract] |
Schedule of Loss Contingencies by Contingency [Table Text Block] | Notes 2 - Revenue Recognition (continued) Sales returns and allowances accrual activity is shown below:
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Beginning balance |  | $ | 36,680 |  |  | $ | 34,479 |  |  | $ | 32,487 |
Sales allowances |  |  | 102,026 |  |  |  | 89,009 |  |  |  | 86,896 |
Credits issued |  |  | (95,521 | ) |  |  | (87,403 | ) |  |  | (85,341 | )
Foreign currency |  |  | (522 | ) |  |  | 595 |  |  |  | 437 |
Ending balance |  | $ | 42,663 |  |  | $ | 36,680 |  |  | $ | 34,479 |

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