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Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 28, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts [Table Text Block] | The following table sets forth activity in Kopin's allowance for doubtful accounts:
Fiscal year ended: | Balance at Beginning of Year |  | Additions Charged to Income |  | Deductions from Reserve |  | Balance at End of Year
December 30, 2017 | $ | 136,000 |  |  | $ | 13,000 |  |  | $ | — |  |  | $ | 149,000 |
December 29, 2018 | 149,000 |  |  | 268,000 |  |  | (113,000 | ) |  | 304,000 |
December 28, 2019 | $ | 304,000 |  |  | $ | 951,000 |  |  | $ | (317,000 | ) |  | $ | 938,000 |

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