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Note 4 - Revenue Recognition (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2021 | Jan. 31, 2020
Costs Incurred for Uncompleted Contracts, Anticipated Collection Period (Year) | 1 year |
Contract with Customer, Liability, Revenue Recognized | $ 1.2 | $ 1.6
Middle East [Member] |  |
Unbilled Receivables, Current | 0.2 |
Other Nonoperating Income (Expense) [Member] |  |
Expense Related to Encashment | $ 0.6 |

X
- Definition Represents the duration of time within which costs incurred for uncompleted contracts are anticipated to be collected. + References No definition available. + Details
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Namespace Prefix: | ppih_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents expense related to encashment. + References No definition available. + Details
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Namespace Prefix: | ppih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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X
- 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: |