XML 51 R38.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Valuation and Qualifying Accounts (Tables) | 12 Months Ended
--- | ---
Dec. 25, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts | The following table sets forth activity in Kopin’s allowance for doubtful accounts: Schedule of Valuation and Qualifying Accounts
Fiscal year ended: |  | Balance at Beginning of Year |  |  | Additions Charged to Income |  |  | Deductions from Reserve |  |  | Balance at End of Year |
December 28 2019 |  |  | 304,000 |  |  |  | 951,000 |  |  |  | (317,000 | ) |  |  | 938,000 |
December 26, 2020 |  |  | 938,000 |  |  |  | 42,000 |  |  |  | (805,000 | ) |  |  | 175,000 |
December 25, 2021 |  | $ | 175,000 |  |  | $ | 55,000 |  |  | $ | (80,000 | ) |  | $ | 150,000 |

X
- Definition Schedule of valuation and qualifying accounts [Table Text Block] + References No definition available. + Details
Name: | KOPN_ScheduleOfValuationAndQualifyingAccountsTableTextBlock
Namespace Prefix: | KOPN_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | srt_ValuationAndQualifyingAccountsAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration