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v3.19.1

Securities Available for Sale - Additional Information (Detail) | 12 Months Ended
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Jan. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items] |
Impairment charges on available for sale security | $ 0
Minimum [Member] |
Debt Securities, Available-for-sale [Line Items] |
Original maturity of short-term investments | 90 days
Anticipated maturity period | 1 month
Maximum [Member] |
Debt Securities, Available-for-sale [Line Items] |
Anticipated maturity period | 13 months

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- Definition Available For Sale Securities Expected Maturity Period + References No definition available. + Details
Name: | alot_AvailableForSaleSecuritiesExpectedMaturityPeriod
Namespace Prefix: | alot_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum number of days that short-term investments would mature. + References No definition available. + Details
Name: | alot_ShortTermInvestmentMaturityPeriod
Namespace Prefix: | alot_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |