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Note 1 - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Number of Gaming Entertainment Properties, Open and Operating | 26 |  | 26 |
Number of Gaming Entertainment Properties | 28 |  | 28 |
Taxes, Other | $ 177,500 | $ 34,800 | $ 336,300 | $ 144,800

X
- Definition The number of gaming entertainment properties. + References No definition available. + Details
Name: | byd_NumberOfGamingEntertainmentProperties
Namespace Prefix: | byd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents number of gaming entertainment properties open and operating. + References No definition available. + Details
Name: | byd_NumberOfGamingEntertainmentPropertiesOpenAndOperating
Namespace Prefix: | byd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of tax expense classified as other. + References No definition available. + Details
Name: | us-gaap_TaxesOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration