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Income Taxes - (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 28, 2022
Dec. 29, 2021
Dec. 30, 2020
Valuation Allowance [Line Items]      
Expense from disallowed compensation deductions   $ 1,300,000 $ 1,000,000
Income tax refunds   1,500,000  
Net operating loss carryback     $ 900,000
Net operating loss carryforwards - state $ 1,157,000 1,429,000  
Valuation allowance 2,738,000 2,192,000  
Interest and penalties recognized on unrecognized tax benefits 0 $ 0  
South Carolina NOL Carryforwards      
Valuation Allowance [Line Items]      
Net operating loss carryforwards - state 900,000    
Valuation allowance 600,000    
State Enterprise Zone Credits      
Valuation Allowance [Line Items]      
Valuation allowance 1,200,000    
Foreign Tax Credit Carryforward      
Valuation Allowance [Line Items]      
Valuation allowance $ 900,000