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Note 11 - Concentrations of Credit Risk, Significant Customers and Geographic Information (Details Textual) - Customer Concentration Risk [Member]
12 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Accounts Receivable [Member] | Significant Customers A, B, and C [Member]    
Number of Major Customers 3  
Concentration Risk, Percentage 53.00%  
Accounts Receivable [Member] | Significant Customers D [Member]    
Number of Major Customers 1  
Concentration Risk, Percentage 23.00%  
Revenue Benchmark [Member] | Outside US [Member]    
Concentration Risk, Percentage 60.00% 77.00%