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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