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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Property, Plant, and Equipment, Useful Life [Table Text Block] |
| Category | Estimated useful life |
| Office equipment (years) | 5 |
| Furniture (years) | 5 |
| Motor vehicles (years) | 10 |
| Leasehold improvements | Lower of lease term or economic life |

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- Definition A tabular disclosure of the useful lives of property, plant, and equipment. + References No definition available. + Details
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Namespace Prefix: | bysi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration