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Notes receivable (Details) - USD ($) shares in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 09, 2023 | May 24, 2022 | Dec. 30, 2023 | Dec. 28, 2024 | Dec. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impairment charge related to note receivable |  |  |  | $ 0 | $ 9,780,000
Principal balance on notes outstanding |  |  | $ 0 | 0 | 0
Carrying value of disposition transaction |  |  | 5,300,000 |  |
GeoTraq Inc. |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Note receivable face amount |  | $ 12,600,000 |  |  |
Note receivable interest rate (as percent) |  | 8.00% |  |  |
Interest income |  |  |  | $ 0 | $ 806,000
SPYR Technologies Inc. |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Term of notes receivable (in years) |  | 5 years |  |  |
Common stock equivalents received (in shares) |  |  |  | 26,253,900 | 922,442
Accrued receivables |  |  | $ 0 |  | $ 0
VM7 Corporation | Stock Purchase Agreement |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest income |  |  |  |  | $ 720,000
Cash paid for close | $ 3,000 |  |  |  |
Revised discount amount | $ 18,000,000.0 |  |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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