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Note 12 - Stock-based Compensation (Tables) | 12 Months Ended
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Jan. 01, 2023
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Fiscal Years |
Stock-based compensation expense included in: |  |  | 2022 |  |  |  | 2021 |  |  |  | 2020 |
Cost of revenue |  | $ | 272 |  |  | $ | 282 |  |  | $ | 162 |
Research and development |  |  | 652 |  |  |  | 843 |  |  |  | 670 |
Selling, general and administrative |  |  | 1,111 |  |  |  | 1,401 |  |  |  | 907 |
Total costs and expenses |  | $ | 2,035 |  |  | $ | 2,526 |  |  | $ | 1,739 |
|  | Fiscal Years |
Stock-based compensation expense by type of award: |  | 2022 |  |  | 2021 |  |  | 2020 |
Stock options |  | $ | — |  |  | $ | — |  |  | $ | 39 |
ESPP |  |  | 70 |  |  |  | 110 |  |  |  | 39 |
RSU and PRSU |  |  | 1,965 |  |  |  | 2,416 |  |  |  | 1,661 |
Total costs and expenses |  | $ | 2,035 |  |  | $ | 2,526 |  |  | $ | 1,739 |
Share-Based Payment Arrangement, Activity [Table Text Block] |
|  | Shares Available for Grant |
Balance at January 3, 2021 |  |  | 320 |
Authorized |  |  | 600 |
Options forfeited or expired |  |  | 31 |
RSUs granted |  |  | (619 | )
RSUs forfeited |  |  | 262 |
Balance at January 2, 2022 |  |  | 594 |
Authorized |  |  | 900 |
RSUs granted |  |  | (584 | )
RSUs forfeited |  |  | 50 |
Balance at January 1, 2023 |  |  | 960 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Term |  |  | Aggregate Intrinsic Value |
|  | (in thousands) |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Balance outstanding at December 29, 2019 |  |  | 186 |  |  | $ | 32.09 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (65 | ) |  |  | 38.83 |  |  |  |  |  |  |  |  |
Balance outstanding at January 3, 2021 |  |  | 121 |  |  |  | 28.46 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (28 | ) |  |  | 31.68 |  |  |  |  |  |  |  |  |
Balance outstanding at January 2, 2022 |  |  | 93 |  |  |  | 27.49 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (18 | ) |  |  | 39.72 |  |  |  |  |  |  |  |  |
Outstanding, exercisable, and vested at January 1, 2023 |  |  | 75 |  |  | $ | 24.50 |  |  |  | 2.80 |  |  | $ | — |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
| RSUs Outstanding
| Number of Shares |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |  |
Nonvested at December 30, 2019 |  | 377 |  | $ | 12.55
Granted |  | 816 |  |  | 3.97
Vested |  | (144 | ) |  | 10.41
Forfeited |  | (249 | ) |  | 7.93
Nonvested at January 3, 2021 |  | 800 |  |  | 4.99
Granted |  | 619 |  |  | 5.81
Vested |  | (586 | ) |  | 4.99
Forfeited |  | (265 | ) |  | 5.00
Nonvested at January 2, 2022 |  | 568 |  |  | 5.86
Granted |  | 584 |  |  | 6.11
Vested |  | (490 | ) |  | 5.56
Forfeited |  | (32 | ) |  | 5.35
Nonvested at January 1, 2023 |  | 630 |  | $ | 6.05
Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | Fiscal Years |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Expected life (months) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Risk-free interest rate |  |  | 3.04 | % |  |  | 0.05 | % |  |  | 0.12 | %
Volatility |  |  | 57 | % |  |  | 74 | % |  |  | 82 | %
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Weighted average fair value of ESPP options granted |  | $ | 2.04 |  |  | $ | 2.18 |  |  | $ | 1.09 |

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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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -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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