Shareholders' Equity (Deficit): Dividends and Repurchase of Common Stock (Details) - USD ($)			1 Months Ended	3 Months Ended
	Mar. 28, 2019	Jan. 23, 2019	Feb. 28, 2019	Mar. 30, 2019	Mar. 31, 2018
Dividends
Cash dividends declared and paid (in dollars per share)		$ 0.15
Aggregate quarterly cash dividends declared and paid				$ 586,100	$ 423,200
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
Common Stock Repurchase Program
Repurchase of Common Stock
Number of additional shares that can be repurchased				130,604