Geographic Information (Detail)	Aug. 31, 2012
Threshold For Geographic Concentration Disclosure Percentage	10.00%

Threshold percentage which the entity uses for geographic concentration.

No definition available.

Name:	bmra_ThresholdForGeographicConcentrationDisclosurePercentage
Namespace Prefix:	bmra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant