Note 5 - Property and Equipment (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Annual Depreciation Rate	20.00%		20.00%
Write Off of Fully Depreciated Property and Equipment	$ 183	$ 283	$ 1,803	$ 994