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GAIN FROM LEGAL SETTLEMENT (Details) (Gain from legal settlement [Member], USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2011 | Dec. 31, 2012
Gain from legal settlement [Member] |  |
Loss Contingencies [Line Items] |  |
Onetime payment received from plaintiff |  | $ 750,000
Amount of finished products not able to sell due to settlement |  | 100,000
Amount of inventory reserved for settlement | $ 87,000 |

X
- Definition Refers to amount of inventory reserved for settlement during the period. + References No definition available. + Details
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Namespace Prefix: | bvx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of finished products not able to sell due to settlement with plaintiff. + References No definition available. + Details
Name: | bvx_RestrictedInventoryUnderSettlement
Namespace Prefix: | bvx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration