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7. Stockholders' Equity Stockholders' Equity Shares Detail (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2015
23,972

 
5,099

B to A conversions
18

 
(18
)
Issuance of common stock
240

 
50

Balance at December 31, 2015
24,230

 
5,131

B to A conversions
13

 
(13
)
Issuance of common stock
211

 
6

Balance at December 31, 2016
24,454

 
5,124

B to A conversions
34

 
(34
)
Issuance of common stock
191

 
18

Balance at December 31, 2017
24,679

 
5,108