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v3.25.0.1

Note 2 - New Accounting Pronouncements (Details Textual) | 12 Months Ended
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Dec. 31, 2024
Percentage of Company Loans, LIBOR Used as Index Rate | 5.30%

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- Definition The percentage of company loans on which LIBOR is used as index rate. + References No definition available. + Details
Name: | alrs_PercentageOfCompanyLoansLiborUsedAsIndexRate
Namespace Prefix: | alrs_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration