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7. Stockholders' Equity | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity Attributable to Parent [Abstract] |
Stockholders' Equity Note Disclosure [Text Block] | 7. STOCKHOLDERS' EQUITY Bio-Rad’s issued and outstanding stock consists of Class A Common Stock (Class A) and Class B Common Stock (Class B). Each share of Class A and Class B participates equally in the earnings of Bio-Rad, and is identical in all respects except as follows. Class A has limited voting rights. Each share of Class A is entitled to one tenth of a vote on most matters, and each share of Class B is entitled to one vote. Additionally, Class A stockholders are entitled to elect 25% of the Board of Directors and Class B stockholders are entitled to elect 75% of the directors. Cash dividends may be paid on Class A shares without paying a cash dividend on Class B shares but no cash dividend may be paid on Class B shares unless at least an equal cash dividend is paid on Class A shares. Class B shares are convertible at any time into Class A shares on a one-for-one basis at the option of the stockholder. The founders of Bio-Rad, the Schwartz family, collectively hold a majority of Bio-Rad’s voting stock. As a result, the Schwartz family is able to exercise significant influence over Bio-Rad. Changes to Bio-Rad's issued common stock shares are as follows (in thousands):
| Class A Shares |  | Class B Shares
Balance at January 1, 2016 | 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 |
B to A conversions | 30 |  |  | (30 | )
Issuance of common stock | 175 |  |  | 18 |
Balance at December 31, 2018 | 24,884 |  |  | 5,096 |
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 This new authorization superseded the prior authorization of up to $18.0 million of Bio-Rad's common stock and has no expiration.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 shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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