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v3.24.3

Note 12 - Long-term Debt - Schedule of Long-term Debt (Details) (Parentheticals) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Junior Subordinated Debenture Trust I [Member] |  |
Long-Term Debt, Basis Spread on Variable Rate | 0.26% | 0.26%
Long-Term Debt, Adjustment, Variable Rate | $ 3,100 | $ 3,100
Junior Subordinated Debenture Trust II [Member] |  |
Long-Term Debt, Basis Spread on Variable Rate | 0.26% | 0.26%
Long-Term Debt, Adjustment, Variable Rate | $ 1,800 | $ 1,800

X
- Definition Percentage points adjusted to the reference rate to compute the variable rate on a debt instrument. + References No definition available. + Details
Name: | alrs_DebtInstrumentAdjustmentVariableRate
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=alrs_JuniorSubordinatedDebentureTrustIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=alrs_JuniorSubordinatedDebentureTrustIiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |