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Note 4 - Revenue Recognition - Contract With Customer, Asset and Liability (Details) - USD ($) $ in Thousands | 3 Months Ended
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Oct. 31, 2020 | Jul. 31, 2020 | Apr. 30, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019
Balance, assets | $ 1,750 | $ 2,900 | $ 2,166 | $ 3,474 | $ 1,983 | $ 1,653
Costs and gross profit recognized during the period for uncompleted contracts from the prior period | (930) | (1,743) | (2,896) | (1,799) | (1,509) | (1,038)
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period | 542 | 593 | 3,630 | 2,688 | 3,000 | 1,368
Balance, assets | 1,362 | 1,750 | 2,900 | 4,363 | 3,474 | 1,983
Balance, liabilities | 767 | 1,061 | 1,173 | 1,141 | 1,846 | 1,569
Revenue recognized during the period for uncompleted contracts from the prior period | 104 | 631 | (17) | (774) | (1,250) | (444)
New contracts entered into that are uncompleted at the end of the current period | (199) | (925) | (95) | 984 | 545 | 721
Balance, liabilities | $ 672 | $ 767 | $ 1,061 | $ 1,351 | $ 1,141 | $ 1,846

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- Definition Represents the amount of revenue and costs incurred during the period, added to the balance of the asset from contracts with customers. + References No definition available. + Details
Name: | ppih_ContractWithCustomerAssetRevenueAndCostsIncurred
Namespace Prefix: | ppih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of liability from contracts with customers incurred during the period from new contracts entered into that are uncompleted at the end of the current period. + References No definition available. + Details
Name: | ppih_ContractWithCustomerLiabilityLiabilityIncurredDuringPeriod
Namespace Prefix: | ppih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + 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 (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
Name: | us-gaap_ContractWithCustomerAssetNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
Name: | us-gaap_ContractWithCustomerAssetReclassifiedToReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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