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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2013 | Jan. 31, 2012
--- | --- | ---
Assets measured at fair value on a recurring basis |  |
Money market funds (included in cash and cash equivalents) | $ 8,784 | $ 5,922
State and municipal obligations (included in Securities available for sale) | 8,509 | 11,336
Total | 17,293 | 17,258
Level 1 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Money market funds (included in cash and cash equivalents) | 8,784 | 5,922
State and municipal obligations (included in Securities available for sale) | 8,509 | 11,336
Total | 17,293 | 17,258
Level 2 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Money market funds (included in cash and cash equivalents) |  |
State and municipal obligations (included in Securities available for sale) |  |
Total |  |
Level 3 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Money market funds (included in cash and cash equivalents) |  |
State and municipal obligations (included in Securities available for sale) |  |
Total |  |

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- Definition Money market funds at fair value. + References No definition available. + Details
Name: | alot_MoneyMarketFundsAtFairValue
Namespace Prefix: | alot_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentsOwnedAtFairValueByTypeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by state and local governments and authorities. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475986&loc=d3e42546-110969 + Details
Name: | us-gaap_FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant