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Note 11 - Long-term Debt - Schedule of Long-term Debt (Details) (Parentheticals) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) [Member] | Secured Overnight Financing Rate (SOFR) [Member]
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
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Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates type of variable interest rate on debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |