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Shareholders' Equity (Deficit): Dividends and Repurchase of Common Stock (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 16, 2017 | Jul. 19, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Repurchase of Common Stock |  |  |  |  |
Aggregate purchase price of shares repurchased (in dollars) |  |  | $ 1,846,400 | $ 49,902,500 | $ 1,573,900
Dividends |  |  |  |  |
Cash dividends declared and paid (in dollars per share) |  |  | $ 0.56 | $ 0.43 | $ 0.37
Aggregate quarterly cash dividends declared and paid |  |  | $ 2,169,900 | $ 1,765,000 | $ 1,526,800
Tender Offer |  |  |  |  |
Repurchase of Common Stock |  |  |  |  |
Shares authorized for repurchase |  | 400,000 |  |  |
Purchase of stock, price per share |  | $ 124.48 |  |  |
Number of shares repurchased | 400,000 |  |  |  |
Aggregate purchase price of shares repurchased (in dollars) | $ 49,900,000 |  |  |  |
Common Stock Repurchase Program |  |  |  |  |
Repurchase of Common Stock |  |  |  |  |
Number of shares repurchased |  |  | 12,384 | 17,194 |
Aggregate purchase price of shares repurchased (in dollars) |  |  | $ 1,800,000 | $ 1,600,000 |
Aggregate purchase price per share of shares repurchased (in dollars per share) |  |  | $ 149.10 | $ 91.54 |
Number of additional shares that can be repurchased |  |  | 130,604 |  |

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