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Stock Option Activity (Details) - $ / shares | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 28, 2015 | Dec. 31, 2015 | Dec. 28, 2014
Number of Common Shares, Options Outstanding |  |  |  |
Number of Common Shares, Options Outstanding, Beginning of year | 2,419,529 | 755,617 |  |
Number of Common Shares, Options Outstanding, Granted | 223,070 |  |  |
Number of Common Shares, Options Outstanding, Exercised | (294,956) | (2,500) |  |
Number of Common Shares, Options Outstanding, Cancelled | (10,000) |  |  |
Number of Common Shares, Options Outstanding, End of year | 2,337,643 | 753,117 |  |
Number of Common Shares, Exercisable |  |  |  |
Number of Common Shares Exercisable | 429,573 | 677,870 | 724,529 | 616,792
Number of Common Shares, Available for Grant |  |  |  |
Number of Common Shares, Available for Grant, beginning of year | 837,635 | 276,635 |  |
Number of Common Shares, Available for Grant, Authorized | 874,709 |  |  |
Number of Common Shares, Available for Grant, Granted | (223,070) |  |  |
Number of Common Shares, Available for Grant, Cancelled | 10,000 |  |  |
Number of Common Shares, Available for Grant, end of year | 1,499,274 | 276,635 |  |
Weighted Average Exercise Price |  |  |  |
Weighted Average Exercise Price, beginning of year | $ 8.16 | $ 6.09 |  |
Weighted Average Exercise Price, Granted | 11.19 |  |  |
Weighted Average Exercise Price, Exercised | 11.21 | 6.14 |  |
Weighted Average Exercise Price, Cancelled | 9.33 |  |  |
Weighted Average Exercise Price, end of year | $ 8.75 | $ 6.09 |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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