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Note 3 - Restructuring and Other Charges - Restructuring and Related Costs (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 28, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Impairment of ROU asset |  | $ 612 | $ 612 |
EMS Segment Restructuring and Facility Consolidation [Member] |  |  |  |
Severance and other one-time termination benefits |  |  | 69 |
Other associated costs |  |  | 159 |
Impairment of ROU asset | $ 522 |  | 522 |
Costs related to subletting the Fremont, CA facility |  |  | 153 |
Total |  |  | 903 |
Executive Management Changes [Member] |  |  |  |
Severance and other one-time termination benefits |  |  | 133 |
Other associated costs |  |  | 381 |
Impairment of ROU asset |  | $ 90 | 90 |
Total |  |  | 703 |
Costs related to subletting the Mansfield, MA facility |  |  | 99 |
Cash Charges [Member] | EMS Segment Restructuring and Facility Consolidation [Member] |  |  |  |
Severance and other one-time termination benefits |  |  | 69 |
Other associated costs |  |  | 159 |
Impairment of ROU asset |  |  |  |
Costs related to subletting the Fremont, CA facility |  |  | 153 |
Total |  |  | 381 |
Cash Charges [Member] | Executive Management Changes [Member] |  |  |  |
Severance and other one-time termination benefits |  |  | 133 |
Other associated costs |  |  | 381 |
Impairment of ROU asset |  |  |  |
Total |  |  | 613 |
Costs related to subletting the Mansfield, MA facility |  |  | 99 |
Non-Cash Charges [Member] | EMS Segment Restructuring and Facility Consolidation [Member] |  |  |  |
Severance and other one-time termination benefits |  |  |  |
Other associated costs |  |  |  |
Impairment of ROU asset |  |  | 522 |
Costs related to subletting the Fremont, CA facility |  |  |  |
Total |  |  | 522 |
Non-Cash Charges [Member] | Executive Management Changes [Member] |  |  |  |
Severance and other one-time termination benefits |  |  |  |
Other associated costs |  |  |  |
Impairment of ROU asset |  |  | 90 |
Total |  |  | 90 |
Costs related to subletting the Mansfield, MA facility |  |  |  |

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