Note 6 - Income taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 29, 2013	Sep. 30, 2012	Dec. 30, 2012
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ (35)	$ (78)	$ 795	$ 795	$ 328
Tax Adjustments, Settlements, and Unusual Provisions		(360)			(210)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount		282			538
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration						83,465
Unrecognized Tax Benefits	266		266	266		274
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 74		$ 74	$ 74		$ 64