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Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue by Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Revenues	$ 283,419	$ 273,800	$ 249,176
Revenues, percentage	100.00%	100.00%	100.00%
Revenues, variance	$ 9,619	$ 24,624
Revenues, variance, percentage	3.50%	9.90%
Internet [Member]
Revenues	$ 240,034	$ 230,319	$ 205,643
Revenues, percentage	84.70%	84.10%	82.50%
Revenues, variance	$ 9,715	$ 24,676
Revenues, variance, percentage	4.20%	12.00%
Contact Center [Member]
Revenues	$ 43,385	$ 43,481	$ 43,533
Revenues, percentage	15.30%	15.90%	17.50%
Revenues, variance	$ (96)	$ (52)
Revenues, variance, percentage	0.20%	0.10%
Reorder Customer [Member]
Revenues	$ 241,780	$ 227,513	$ 206,299
Revenues, percentage	85.30%	83.10%	82.80%
Revenues, variance	$ 14,267	$ 21,214
Revenues, variance, percentage	6.30%	10.30%
New Order Customer [Member]
Revenues	$ 41,639	$ 46,287	$ 42,877
Revenues, percentage	14.70%	16.90%	17.20%
Revenues, variance	$ (4,648)	$ 3,410
Revenues, variance, percentage	10.00%	8.00%

X

- Definition

Percentage of revenue from the specified category to the total revenue during the period.

+ References

No definition available.

+ Details

Name:	pets_RevenueFromContractWithCustomerPercentage
Namespace Prefix:	pets_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of changes in revenue in current period comparing to the same period in the previous year.

+ References

No definition available.

+ Details

Name:	pets_RevenueFromContractWithCustomerVariance
Namespace Prefix:	pets_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The percentage of changes in revenue in current period comparing to the same period in the previous year.

+ References

No definition available.

+ Details

Name:	pets_RevenueFromContractWithCustomerVariancePercentage
Namespace Prefix:	pets_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=pets_InternetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=pets_ContactCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=pets_ReorderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: