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% |