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Inventory (Details 1) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reserve for Inventory |  |
Balance at Beginning of Year | $ 4,274,000 | $ (3,776,000)
Additions to Reserve | (163,000) | (503,000)
Deductions from Reserves | 421,000 | 5,000
Balance at End of Year | $ 4,016,000 | $ 4,274,000

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