Shareholders' Equity: (Details) (USD $)	0 Months Ended		3 Months Ended
	Feb. 04, 2014	Jan. 29, 2014	Mar. 29, 2014 Common Stock Repurchase Program
Dividends
Cash dividend approved by Board of Directors (in dollars per share)		$ 0.05
Special cash dividend approved by Board of Directors (in dollars per share)	$ 5.00
Total special dividend in cash	$ 25,800,000
Borrowings on line of credit for special dividend	13,000,000
Repurchase of Common Stock
Number of shares repurchased			14,066
Aggregate purchase price of shares repurchased (in dollars)			$ 1,075,100
Aggregate purchase price per share of shares repurchased (in dollars per share)			$ 76.43
Number of additional shares that can be repurchased			318,664