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Note 8 - Stock-based Compensation (Tables) | 6 Months Ended
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Jul. 03, 2022
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | July 3, 2022 |  |  | July 4, 2021 |  |  | July 3, 2022 |  |  | July 4, 2021 |
Cost of revenue |  | $ | 117 |  |  | $ | 18 |  |  | $ | 173 |  |  | $ | 54 |
Research and development |  |  | 91 |  |  |  | 82 |  |  |  | 176 |  |  |  | 239 |
Selling, general and administrative |  |  | 269 |  |  |  | 102 |  |  |  | 511 |  |  |  | 277 |
Total |  | $ | 477 |  |  | $ | 202 |  |  | $ | 860 |  |  | $ | 570 |
Share-Based Payment Arrangement, Activity [Table Text Block] |
| Shares Available for Grants |
Balance at January 2, 2022 |  | 594 |
Authorized |  | 908 |
RSUs granted |  | (99 | )
RSUs forfeited or expired |  | 18 |
Balance at July 3, 2022 |  | 1,421 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Average |  |  | Average |  |  | Aggregate |
|  | Number of |  |  | Exercise |  |  | Remaining |  |  | Intrinsic |
|  | Shares |  |  | Price |  |  | Term |  |  | Value |
|  | (in thousands) |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Balance outstanding at January 2, 2022 |  |  | 93 |  |  | $ | 27.49 |  |  |  |  |  |  |  |  |
Expired |  |  | (9 | ) |  | $ | 48.03 |  |  |  |  |  |  |  |  |
Balance outstanding at July 3, 2022 |  |  | 84 |  |  | $ | 25.42 |  |  |  | 2.94 |  |  | $ | — |
Exercisable at July 3, 2022 |  |  | 84 |  |  | $ | 25.42 |  |  |  | 2.94 |  |  | $ | — |
Vested and expected to vest at July 3, 2022 |  |  | 84 |  |  | $ | 25.42 |  |  |  | 2.94 |  |  | $ | — |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
| RSUs & PRSUs Outstanding
|  |  |  | Weighted
|  |  |  | Average
| Number of |  | Grant Date
| Shares |  | Fair Value
| (in thousands) |  |  |
Nonvested at January 2, 2022 |  | 568 |  | $ | 5.86
Granted |  | 99 |  |  | 5.51
Vested |  | (229 | ) |  | 5.95
Forfeited |  | (22 | ) |  | 5.09
Nonvested at July 3, 2022 |  | 416 |  | $ | 5.78

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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