Note 17 - Severance, Professional Fees and Other Charges (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Severance, Professional Fees and Other Charges			$ 1,371	$ 0
Transactional Advisory Fees, Legal Fees, and Search Fees [Member]
Severance, Professional Fees and Other Charges			500
Former Chief Executive Officer [Member] | Severance Accrued and Related Payroll Taxes, Continuation of Certain Benefits and Professional Fees [Member]
Severance, Professional Fees and Other Charges			$ 900