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Note 2 - Revenue Recognition (Details Textual)	3 Months Ended
	Jun. 30, 2019
Minimum [Member]
Credit Card Sales, Cash Settlement Period	2 days
Maximum [Member]
Credit Card Sales, Cash Settlement Period	3 days

X

- Definition

Banking days the Company usually receives the cash settlement for sales paid by credit cards.

+ References

No definition available.

+ Details

Name:	pets_CreditCardSalesCashSettlementPeriod
Namespace Prefix:	pets_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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