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Commitments and Contingencies Textuals (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Liabilty Recorded For Stanby Letter of Credit [Abstract]
Liability Recorded For Standy Letters Of Credit	$ 39	$ 73

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- References

No definition available.

+ Details

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Namespace Prefix:	aubn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

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Name:	aubn_LiabiltyRecordedForStanbyLetterOfCreditAbstract
Namespace Prefix:	aubn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration