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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Undistributed Earnings of Foreign Subsidiaries $ 6.3    
Unrecognized Tax Benefits 1.0 $ 0.7  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 0.4 0.2  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0.1 0.4  
Income Tax Examination, Penalties and Interest Benefit 0.3    
Income Tax Examination, Penalties and Interest Expense   0.1  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 0.9    
Foreign Tax Authority [Member]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 0.6    
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member] | Earliest Tax Year [Member]      
Open Tax Year 2009    
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member] | Latest Tax Year [Member]      
Open Tax Year 2016    
Foreign Tax Authority [Member] | UK and Canada [Member]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ 1.1
Domestic Tax Authority [Member]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 9.4 $ 4.4
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]      
Open Tax Year 2013    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]      
Open Tax Year 2016