Note 8 - Retirement Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2024	Jan. 31, 2023
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	1.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Payroll Deferral Contributions	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay, Payroll Deferral Contributions	5.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.4	$ 0.3
Minimum [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	1.00%
Maximum [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	16.00%

Percentage of employees' gross pay for which the employer contributes a matching payroll deferral contribution to a defined contribution plan.

No definition available.

Name:	ppih_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayPayrollDeferralContributions
Namespace Prefix:	ppih_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of payroll deferral contributions employer matches of the employee's percentage contribution matched.

No definition available.

Name:	ppih_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchPayrollDeferralContributions
Namespace Prefix:	ppih_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage employer matches of the employee's percentage contribution matched.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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