Note 2 - Revenue Recognition (Details Textual)	6 Months Ended
Sep. 30, 2019
Minimum [Member]
Credit Card Sales, Cash Settlement Period	2 days
Maximum [Member]
Credit Card Sales, Cash Settlement Period	3 days

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

No definition available.

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