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Note 13 - Subsequent Event (Details Textual) - Subsequent Event [Member] - Revolving Credit Facility [Member] | Nov. 01, 2023 USD ($)
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Line of Credit Facility, Maximum Borrowing Capacity | $ 300,000,000.0
Line of Credit Facility, Minimum Balance Threshold | $ 190,000,000
Debt Instrument, Prime Rate Floor | 0.00%
Prime Rate [Member] |
Debt Instrument, Basis Spread on Variable Rate | 1.95%

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- Definition The prime rate floor of the debt instrument. + References No definition available. + Details
Name: | rusha_DebtInstrumentPrimeRateFloor
Namespace Prefix: | rusha_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The minimum balance threshold of the line of credit facility. + References No definition available. + Details
Name: | rusha_LineOfCreditFacilityMinimumBalanceThreshold
Namespace Prefix: | rusha_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |