Note 5 - Goodwill, Intangible Assets and Long Term Assets Composition of Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Amortization expense	$ 61,000	$ 78,000	$ 180,000	$ 232,000
Selling, General and Administrative Expenses
Amortization expense	29,000	34,000	83,000	101,000
Research and Development Expense
Amortization expense	$ 32,000	$ 44,000	$ 97,000	$ 131,000