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Note 9 - Stock-based Compensation - Share Based Compensation Performance Shares Award Market Condition or Performance Condition (Details) - Performance Shares [Member] shares in Thousands | 9 Months Ended
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Sep. 27, 2025 shares
Balance, Shares (in shares) | 1,593
Granted, Shares (in shares) | 799
Effect of vesting multiplier, Shares (in shares) | 19
Vested, Shares (in shares) | (101)
Canceled, Shares (in shares) | (223)
Balance, Shares (in shares) | 2,087

X
- Definition The number of shares awarded and vested due to the effect of the vesting multiplier during the period on stock (or unit) option and non-option instrument plans. + References No definition available. + Details
Name: | lscc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedEffectOfVestingMultiplier
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross number of nonvested share options and non-option equity instruments (or share units) granted during the period. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedGrantsInPeriodGross
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of non-vested options and non-option equity instruments outstanding. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedNumberOfShares
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of non-vested options and non-option equity instruments forfeited. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonOptionEquityInstrumentsNonvestedOptionsForfeitedNumberOfShares
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of vested options and non-option equity instruments. + References No definition available. + Details
Name: | lscc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndNonoptionEquityInstrumentsVestedInPeriodNumberOfShares
Namespace Prefix: | lscc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |