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

The percentage of company loans on which LIBOR is used as index rate.

No definition available.

Name:	alrs_PercentageOfCompanyLoansLiborUsedAsIndexRate
Namespace Prefix:	alrs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration