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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:

 

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