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Valuation and Qualifying Accounts (Notes)
 12 Months Ended
Dec. 28, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
18.    Valuation and Qualifying Accounts
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