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Note 17 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jul. 01, 2016
Nov. 01, 2015
Dec. 31, 2018
Dec. 31, 2017
Restricted Cash and Cash Equivalents, Total     $ 9,700 $ 9,600
Cash, Uninsured Amount     10,700 5,900
Marketing Agreement [Member]        
Purchase Obligation Term of Contract 3 years 3 years    
Marketing Expense     65 $ 55
Purchase Obligation, Due in Next Twelve Months     $ 33