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7. Stockholders' Equity Stockholders' Equity Shares Detail (Tables)
 12 Months Ended
Dec. 31, 2014
Class of Stock [Line Items]  
Schedule of Stock by Class [Table Text Block]
Changes to Bio-Rad's issued common stock shares are as follows (in thousands):
 
Class A Shares
 
Class B Shares
Balance at January 1, 2012
23,020

 
5,165

B to A conversions
59

 
(59
)
Issuance of common stock
253

 
44

Balance at December 31, 2012
23,333

 
5,150

B to A conversions
80

 
(80
)
Issuance of common stock
269

 
27

Balance at December 31, 2013
23,681

 
5,097

B to A conversions
5

 
(5
)
Issuance of common stock
286

 
7

Balance at December 31, 2014
23,972

 
5,099