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Leases (Schedule Of Right-Of-Use Assets And Lease Liabilities By Lease Type) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Leases [Abstract] |  |
Right-of-use assets | $ 6,119 | $ 6,933
Total right-of-use assets | 6,119 | 6,933
Lease liabilities | 6,763 | 7,686
Total lease liabilities | $ 6,763 | $ 7,686

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- Definition Total Lease Liabilities + References No definition available. + Details
Name: | avbh_TotalLeaseLiabilities
Namespace Prefix: | avbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total Right-of-Use Assets + References No definition available. + Details
Name: | avbh_TotalRightOfUseAssets
Namespace Prefix: | avbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant