INTANGIBLE ASSETS, NET (Details) - Intangible assets, net - USD ($)	May 31, 2021	May 31, 2020
Intangible assets, net [Abstract]
Licenses	$ 182,176	$ 551,397
Patents	239,423	113,382
Less accumulated amortization-licenses	(107,194)	(487,989)
Less accumulated amortization-patents	(19,575)	(8,135)
Intangible asssets, net	$ 294,830	$ 168,655

Accumulated amount of amortization of licenses.

No definition available.

Name:	bmra_FiniteLivedLicenseAccumulatedAmortization
Namespace Prefix:	bmra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Accumulated amount of amortization of patents.

+ References

No definition available.

+ Details

Name:	bmra_FiniteLivedPatentsAccumulatedAmortization
Namespace Prefix:	bmra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	bmra_IntangibleAssetsNetAbstract
Namespace Prefix:	bmra_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross carrying amount as of the balance sheet date of certain rights acquired to exercise a certain privilege or pursue a particular business or occupation and which is deemed to have a finite economic life.

+ References

+ Details

Name:	us-gaap_FiniteLivedLicenseAgreementsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Gross carrying amount before accumulated amortization as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights.

+ References

+ Details

Name:	us-gaap_FiniteLivedPatentsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph ((a)(1),(b))
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

+ Details

Name:	us-gaap_IntangibleAssetsNetExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant