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Note 13 - Stock-based Compensation (Tables) | 12 Months Ended
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Jan. 02, 2022
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Fiscal Years |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Cost of revenue |  | $ | 282 |  |  | $ | 162 |  |  | $ | 78 |
Research and development |  |  | 843 |  |  |  | 670 |  |  |  | 2,242 |
Selling, general and administrative |  |  | 1,401 |  |  |  | 907 |  |  |  | 824 |
Total costs and expenses |  | $ | 2,526 |  |  | $ | 1,739 |  |  | $ | 3,144 |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  | Shares Available for Grant |
Balance at December 29, 2019 |  |  | 272 |
Authorized |  |  | 550 |
Options granted |  |  | — |
Options forfeited or expired |  |  | 65 |
RSUs granted |  |  | (816 | )
RSUs forfeited |  |  | 249 |
Balance at January 3, 2021 |  |  | 320 |
Authorized |  |  | 600 |
Options granted |  |  | — |
Options forfeited or expired |  |  | 31 |
RSUs granted |  |  | (619 | )
RSUs forfeited |  |  | 262 |
Balance at January 2, 2022 |  |  | 594 |
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 30, 2018 |  |  | 229 |  |  | $ | 30.52 |  |  |  | 3.70 |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (42 | ) |  |  | 24.14 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1 | ) |  |  | 10.92 |  |  |  |  |  |  |  |  |
Balance outstanding at December 29, 2019 |  |  | 186 |  |  |  | 32.09 |  |  |  | 3.32 |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (65 | ) |  |  | 38.83 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Balance outstanding at January 3, 2021 |  |  | 121 |  |  |  | 28.46 |  |  |  | 3.75 |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (28 | ) |  |  | 31.68 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Balance outstanding at January 2, 2022 |  |  | 93 |  |  | $ | 27.49 |  |  |  | 3.19 |  |  | $ | — |
Exercisable and Vested and expected to vest at January 2, 2022 |  |  | 93 |  |  | $ | 27.49 |  |  |  | 3.19 |  |  | $ | — |
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Options Outstanding |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Options Vested and Exercisable |  |  | Weighted Average Exercise Price |
|  | (in thousands) |  |  | (in years) |  |  |  |  |  |  | (in thousands) |  |  |  |  |
$12.05 |  |  | 48 |  |  |  | 4.68 |  |  | $ | 12.05 |  |  |  | 48 |  |  | $ | 12.05 |
$30.38 |  |  | 3 |  |  |  | 0.60 |  |  |  | 30.38 |  |  |  | 3 |  |  |  | 30.38 |
$31.50 |  |  | 5 |  |  |  | 0.85 |  |  |  | 31.5 |  |  |  | 5 |  |  |  | 31.50 |
$32.20 |  |  | 3 |  |  |  | 1.35 |  |  |  | 32.2 |  |  |  | 3 |  |  |  | 32.20 |
$40.18 |  |  | 0.4 |  |  |  | 0.81 |  |  |  | 40.18 |  |  |  | 0.4 |  |  |  | 40.18 |
$44.80 |  |  | 6 |  |  |  | 2.96 |  |  |  | 44.80 |  |  |  | 6 |  |  |  | 44.80 |
$46.62 |  |  | 3 |  |  |  | 2.35 |  |  |  | 46.62 |  |  |  | 3 |  |  |  | 46.62 |
$47.46 |  |  | 13 |  |  |  | 1.94 |  |  |  | 47.46 |  |  |  | 13 |  |  |  | 47.46 |
$48.72 |  |  | 8 |  |  |  | 0.35 |  |  |  | 48.72 |  |  |  | 8 |  |  |  | 48.72 |
$53.48 |  |  | 4 |  |  |  | 2.38 |  |  |  | 53.48 |  |  |  | 4 |  |  |  | 53.48 |
$12.05- $53.48 |  |  | 93 |  |  |  | 3.19 |  |  | $ | 27.49 |  |  |  | 93 |  |  | $ | 27.49 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
| RSUs & PRSUs Outstanding
| Number of Shares |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |  |
Nonvested at December 30, 2018 |  | 183 |  | $ | 17.22
Granted |  | 353 |  |  | 10.77
Vested |  | (118 | ) |  | 14.48
Forfeited |  | (41 | ) |  | —
Nonvested at December 29, 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
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | Fiscal Years |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Expected life (months) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Risk-free interest rate |  |  | 0.05 | % |  |  | 0.12 | % |  |  | 2.37 | %
Volatility |  |  | 74 | % |  |  | 82 | % |  |  | 54 | %
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |

X
- 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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + 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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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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