Fair Value Measurements: Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Dec. 31, 2011
Marketable securities	$ 840	$ 1,666
Fair Value, Inputs, Level 1
Marketable securities	840	1,666
Equity Securities
Marketable securities	638	1,301
Equity Securities | Fair Value, Inputs, Level 1
Marketable securities	638	1,301
Debt Securities
Marketable securities	155	314
Debt Securities | Fair Value, Inputs, Level 1
Marketable securities	155	314
Money Market Funds
Marketable securities	47	51
Money Market Funds | Fair Value, Inputs, Level 1
Marketable securities	$ 47	$ 51