Line of Credit: (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012
One month LIBOR
Line of Credit
Variable rate basis	One month LIBOR
Two month LIBOR
Line of Credit
Variable rate basis	Two month LIBOR
Three month LIBOR
Line of Credit
Variable rate basis	Three month LIBOR
One year fixed rate
Line of Credit
Variable rate basis	One year Fixed Rate
Two year fixed rate
Line of Credit
Variable rate basis	Two year Fixed Rate
Three year fixed rate
Line of Credit
Variable rate basis	Three year Fixed Rate
Four year fixed rate
Line of Credit
Variable rate basis	Four year Fixed Rate
Line of Credit
Line of Credit
Aggregate commitments	35.0
Aggregate commitments, prior to amendment	30.0
Borrowing availability	35.0
Borrowings outstanding	10.8
Amount available for additional borrowings	24.2
Number of interest rate options	3
Non-utilization fees (as a percent)	0.25%
Line of Credit | Minimum
Line of Credit
Interest rate (as a percent)	2.96%
Line of Credit | Maximum
Line of Credit
Interest rate (as a percent)	3.75%
Line of Credit | Base Rate
Line of Credit
Variable rate basis	Base Rate
Applicable margin (as a percent)	0.50%
Line of Credit | LIBOR
Line of Credit
Variable rate basis	LIBOR
Applicable margin (as a percent)	2.75%
Line of Credit | Fixed Rate
Line of Credit
Variable rate basis	Fixed Rate
Applicable margin (as a percent)	2.75%