Note 1 - Basis of Presentation and Significant Accounting Policies - Concentration of Risk By Risk (Details) - Revenue Benchmark [Member]	12 Months Ended
Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Revenue Percentage	83.00%	82.00%	83.00%
Weikeng Group [Member]
Revenue Percentage	35.00%	30.00%	25.00%
Arrow Electronics Inc [Member]
Revenue Percentage	25.00%	25.00%	29.00%
Other [Member]
Revenue Percentage	23.00%	27.00%	29.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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