Fair Value Measurements: Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2013	Dec. 31, 2012
Marketable securities	$ 464	$ 712
Equity Securities
Marketable securities		367
Debt Securities
Marketable securities	422	298
Money Market Funds
Marketable securities	42	47
Fair Value, Inputs, Level 1
Marketable securities	464	712
Fair Value, Inputs, Level 1 | Equity Securities
Marketable securities		367
Fair Value, Inputs, Level 1 | Debt Securities
Marketable securities	422	298
Fair Value, Inputs, Level 1 | Money Market Funds
Marketable securities	$ 42	$ 47