Note 11 - Concentrations of Credit Risk, Significant Customers and Geographic Information (Tables)

12 Months Ended

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	%