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Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
 12 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Dec. 28, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]      
Begining balance $ 175,000 $ 938,000 $ 304,000
Additions charged to Income 55,000 42,000 951,000
Deductions from reserve (80,000) (805,000) (317,000)
Ending balance $ 150,000 $ 175,000 $ 938,000