Note 11 - Concentrations of Credit Risk, Significant Customers and Geographic Information - Significant Customers as a Percentage of Total Revenues (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]	12 Months Ended
	Dec. 25, 2021 Rate	Dec. 26, 2020 Rate
Customer A [Member]
A	24.00%	16.00%
Customer B [Member]
A	16.00%	21.00%
Customer C [Member]
A	11.00%	36.00%