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Note 13 - Related-party Transactions (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Charitable Contribution Collected on Behalf of Related Party [Member] | Charitable Foundations Controlled by Executive Officers [Member]      
Related Party Transaction, Amounts of Transaction $ 0.2 $ 0.5 $ 0.5