Note 18 - Severance, Professional Fees, and Other Charges (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Severance, Professional Fees and Other Charges				$ 1,371
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
Former Chief Executive Officer [Member] | Severance, Legal Fees Related to Acquisition, and Other Legal Miscellaneous Charges [Member]
Severance, Professional Fees and Other Charges				$ 500