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Shareholders' Equity (Deficit): Dividends and Repurchase of Common Stock (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 28, 2019 | Aug. 16, 2017 | Jul. 19, 2017 | Feb. 28, 2019 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Repurchase of Common Stock |  |  |  |  |  |  |
Aggregate purchase price of shares repurchased (in dollars) |  |  |  |  | $ 24,028,100 | $ 1,846,400 | $ 49,902,500
Dividends |  |  |  |  |  |  |
Cash dividends declared and paid (in dollars per share) |  |  |  |  | $ 0.90 | $ 0.56 | $ 0.43
Aggregate quarterly cash dividends declared and paid |  |  |  |  | $ 3,449,100 | $ 2,169,900 | $ 1,765,000
2019 Tender Offer |  |  |  |  |  |  |
Repurchase of Common Stock |  |  |  |  |  |  |
Shares authorized for repurchase per tender offer |  |  |  | 150,000 |  |  |
Price per share of common stock per tender offer |  |  |  | $ 159.63 |  |  |
Number of shares repurchased | 150,000 |  |  |  |  |  |
Purchase price of shares per tender offer | $ 24,000,000 |  |  |  |  |  |
Tender Offer |  |  |  |  |  |  |
Repurchase of Common Stock |  |  |  |  |  |  |
Shares authorized for repurchase per tender offer |  |  | 400,000 |  |  |  |
Price per share of common stock per tender offer |  |  | $ 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 |  |  |  |  |  |  |
Purchase of stock, price per share |  |  |  |  |  | $ 149.10 |
Number of shares repurchased |  |  |  |  |  | 12,384 |
Aggregate purchase price of shares repurchased (in dollars) |  |  |  |  |  | $ 1,800,000 |
Number of additional shares that can be repurchased |  |  |  |  | 130,604 |  |

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