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Note 3 - Revenue Recoginition (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 30, 2017
Contract with Customer, Liability, Revenue Recognized $ 295  
Accounts Payable and Accrued Liabilities [Member]    
Contract with Customer, Liability, Total $ 302 $ 596