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Shareholders' Equity (Deficit): Dividends and Repurchase of Common Stock (Details) - USD ($)			1 Months Ended	3 Months Ended
	Jan. 16, 2020	Jan. 23, 2019	Dec. 31, 2019	Mar. 28, 2020	Mar. 30, 2019
Repurchase of Common Stock
Aggregate purchase price of shares repurchased (in dollars)				$ 48,987,500	$ 24,028,100
Borrowing from Line of Credit for Tender Offer				45,700,000	14,000,000
Dividends
Cash dividends declared and paid (in dollars per share)		$ 0.25
Aggregate quarterly cash dividends declared and paid				$ 912,200	$ 586,100
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
Borrowing from Line of Credit for Tender Offer	$ 19,200,000
Common Stock Repurchase Program
Repurchase of Common Stock
Number of additional shares that can be repurchased					130,604

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