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BUSINESS SEGMENTS (Details) - Business Segments (USD $) | 12 Months Ended
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May 31, 2013 | May 31, 2012
Net sales: |  |
Net Sales | $ 6,472,960 | $ 6,081,131
Europe [Member] |  |
Net sales: |  |
Net Sales | 2,840,000 | 2,533,000
United States [Member] |  |
Net sales: |  |
Net Sales | 822,000 | 1,074,000
Asia [Member] |  |
Net sales: |  |
Net Sales | 2,770,000 | 2,420,000
South America [Member] |  |
Net sales: |  |
Net Sales | 7,000 | 2,000
Middle East [Member] |  |
Net sales: |  |
Net Sales | 31,000 | 22,000
Other Foreign [Member] |  |
Net sales: |  |
Net Sales | $ 3,000 | $ 30,000

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

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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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration