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Note 15 - Related Party Transactions (Details Textual) | Dec. 31, 2022
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William S. Boyd and His Immediate Family [Member] |
Ownership Percentage | 27.00%

X
- Definition Percentage of ownership in the company. + References No definition available. + Details
Name: | byd_OwnershipPercentage
Namespace Prefix: | byd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=byd_WilliamSBoydAndHisImmediateFamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |