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Significant Accounting Policies (Tables)
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3 Months Ended | ||||||||||||||||||||||||||||||||||||
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Mar. 31, 2015
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| Accounting Policies [Abstract] | |||||||||||||||||||||||||||||||||||||
| Schedule of Product Warranty Liability [Table Text Block] | Changes in the warranty reserve during the three months ended March 31, 2015 were as follows:
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