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Note 3 - Accounts Receivable (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Aug. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jul. 31, 2019	Jul. 31, 2020 USD ($)	Jul. 31, 2019	Jan. 31, 2020 USD ($)
Accounts Receivable, Outstanding for Several Years		$ 4,100			$ 4,100		$ 4,100
Retention Receivable		3,600			3,600		$ 3,600
Accounts Receivable, Certified Invoices in Process of Collection			$ 500
Allowance for Doubtful Accounts Receivable Outstanding for Several Years		$ 0			$ 0
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers		0		0	0	0
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers					1		1
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage					14.40%		13.30%
Subsequent Event [Member]
Proceeds from Collection of Accounts Receivable Outstanding for Several Years	$ 200
Other Noncurrent Assets [Member]
Retention Receivable		$ 1,600			$ 1,600		$ 2,100

X

- Definition

Amount of certified invoices included in accounts receivable that are in process of collection.

+ References

No definition available.

+ Details

Name:	ppih_AccountsReceivableCertifiedInvoicesInProcessOfCollection
Namespace Prefix:	ppih_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of accounts receivable, inclusive of retention receivables, that have been outstanding for several years as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppih_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the balance of the allowance for doubtful accounts pertaining to accounts receivable outstanding for several years.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppih_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppih_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the proceeds received during the period from the collection of accounts receivable that have been outstanding for several years.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppih_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of retention receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppih_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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X

- Details

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- Details

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- Details

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X

- Details

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X

- Details

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- Details

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