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Geographic Information (Details) - Financial information about foreign and domestic operations and export sales (USD $)	3 Months Ended		6 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Revenues from sales to unaffiliated customers:
Net sales	$ 1,133,600us-gaap_SalesRevenueNet	$ 934,841us-gaap_SalesRevenueNet	$ 2,168,050us-gaap_SalesRevenueNet	$ 1,948,580us-gaap_SalesRevenueNet
UNITED STATES
Revenues from sales to unaffiliated customers:
Net sales	220,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	251,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	473,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	505,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Asia [Member]
Revenues from sales to unaffiliated customers:
Net sales	102,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember	80,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember	118,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember	216,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Europe [Member]
Revenues from sales to unaffiliated customers:
Net sales	693,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	594,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	1,444,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	1,199,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
South America [Member]
Revenues from sales to unaffiliated customers:
Net sales	3,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember	4,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember	6,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember	7,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember
Middle East [Member]
Revenues from sales to unaffiliated customers:
Net sales	111,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember	5,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember	113,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember	20,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
Other Foreign [Member]
Revenues from sales to unaffiliated customers:
Net sales	$ 5,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = bmra_OtherForeignMember	$ 1,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = bmra_OtherForeignMember	$ 14,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = bmra_OtherForeignMember	$ 2,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = bmra_OtherForeignMember

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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