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BUSINESS SEGMENTS (Detail) - BUSINESS SEGMENTS (USD $) | 12 Months Ended
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May 31, 2012 | May 31, 2011
Net sales: |  |
Net Sales | $ 6,081,000 | $ 4,899,000
Europe |  |
Net sales: |  |
Net Sales | 2,533,000 | 2,483,000
United States |  |
Net sales: |  |
Net Sales | 1,074,000 | 1,160,000
Asia |  |
Net sales: |  |
Net Sales | 2,420,000 | 1,153,000
South America |  |
Net sales: |  |
Net Sales | 2,000 | 28,000
Middle East |  |
Net sales: |  |
Net Sales | 22,000 | 45,000
Other Foreign |  |
Net sales: |  |
Net Sales | $ 30,000 | $ 30,000

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Namespace Prefix: | bmra_
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Balance Type: | na
Period Type: | duration

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + 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=6880815&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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