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7. Stockholders' Equity Treasury Stock (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |
Treasury Stock [Text Block] | Treasury Shares In November, 2017, the Board of Directors authorized a new share repurchase program, granting Bio-Rad authority to repurchase, on a discretionary basis, up to $250.0 million of outstanding shares of our common stock. Repurchases may be made at management's discretion from time to time on the open market or through privately negotiated transactions. This new authorization superseded the prior authorization of up to $18.0 million of Bio-Rad's common stock and has no expiration. The share repurchase activity under the share repurchase program through open market transactions in 2017 and 2018 is summarized as follows:
| Number of Shares Purchased | Weighted-Average Price per Share | Total Shares Repurchased To Date | Remaining Authorized Value (in millions)
May 1, 2017 - May 31, 2017 | 2,500 |  | $ | 220.02 |  | 3,539 |  | $ | 2.7 |
June 1, 2017 - June 30, 2017 | 1,500 |  | $ | 221.82 |  | 5,039 |  | $ | 2.4 |
August 1, 2017 - August 31, 2017 | 9,200 |  | $ | 221.45 |  | 14,239 |  | $ | 0.4 |
November 1, 2018 - November 30, 2018 | 178,911 |  | $ | 273.39 |  | 193,150 |  | $ | 201.1 |
In September 2017, we used 12,740 of the repurchased shares in connection with the vesting of restricted stock units under the 2007 Incentive Award Plan in order to obtain a tax deduction in some of our foreign entities. The Credit Agreement may limit our ability to repurchase our stock.

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- Definition The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2208821 + Details
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