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Shareholders' Equity (Deficit): Dividends and Repurchase of Common Stock (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 16, 2020 | Mar. 28, 2019 | Feb. 28, 2019 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Repurchase of Common Stock |  |  |  |  |  |
Aggregate purchase price of shares repurchased |  |  |  | $ 48,987,500 | $ 24,028,100 | $ 1,846,400
Dividends |  |  |  |  |  |
Cash dividends declared and paid (in dollars per share) |  |  |  | $ 0.80 | $ 0.90 | $ 0.56
Aggregate quarterly cash dividends declared and paid, excluding special dividend |  |  |  | $ 3,000,000.0 |  |
Special cash dividend approved by Board of Directors (in dollars per share) |  |  |  | $ 3.00 |  |
Total special dividend in cash |  |  |  | $ 11,300,000 |  |
Aggregate quarterly cash dividends declared and paid |  |  |  | $ 14,230,800 | $ 3,449,100 | $ 2,169,900
2020 Tender Offer |  |  |  |  |  |
Repurchase of Common Stock |  |  |  |  |  |
Shares authorized for repurchase per tender offer |  |  |  | 300,000 |  |
Price per share of common stock per tender offer |  |  |  | $ 163.00 |  |
Number of shares repurchased | 300,000 |  |  |  |  |
Purchase price of shares per tender offer | $ 49,000,000.0 |  |  |  |  |
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 |  | $ 24,000,000.0 |  |  |  |
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 |  |  |  |  |  | $ 1,800,000
Number of additional shares that can be repurchased |  |  |  | 130,604 |  |

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