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Shareholders' Equity - Additional information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
Class of Stock [Line Items] |  |  |
Company shares given to employees, shares | 15,357 | 20,329 | 33,430
Company shares given to employees, value | $ 0.1 | $ 0.5 | $ 0.6

X
- Definition Number of shares of stock delivered by employers to satisfy the exercise price for stock options exercised and restricted stock vested. + References No definition available. + Details
Name: | alot_StockDeliveredDuringPeriodSharesStockOptionsExercise
Namespace Prefix: | alot_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dollar value of stock delivered by employers to satisfy the exercise price for stock options exercised and restricted stock vested. + References No definition available. + Details
Name: | alot_StockDeliveredDuringPeriodSharesStockOptionsExerciseAmount
Namespace Prefix: | alot_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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