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Note 11 - Concentrations of Credit Risk, Significant Customers and Geographic Information (Tables) | 12 Months Ended
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Dec. 25, 2021
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Percent of Total Revenues |
Significant Customer |  | 2021 |  |  | 2020 |
A |  |  | 24 | % |  |  | 16 | %
B |  |  | 16 | % |  |  | 21 | %
C |  |  | 11 | % |  |  | 36 | %
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Percent of Total Revenues |
Country |  | 2021 |  |  | 2020 |
United States of America |  |  | 40 | % |  |  | 23 | %
Germany |  |  | 14 | % |  |  | 36 | %
Other |  |  | 46 | % |  |  | 41 | %

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