CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parentheticals) (USD $)	9 Months Ended
Feb. 28, 2015	Feb. 28, 2014
Amount due on agreement to purchase restricted stock		$ 100,000

Amount due on agreement to purchase restricted stock.

No definition available.

Name:	bmra_AmountDueOnAgreementToPurchaseRestrictedStock
Namespace Prefix:	bmra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration