Annual report pursuant to Section 13 and 15(d)

Note 8 - Financial Instruments and Risks (Details Textual)

v3.8.0.1
Note 8 - Financial Instruments and Risks (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Dec. 28, 2014
Derivative Asset, Current $ 37 $ 0 $ 0  
Derivative Liability, Current 375 1,256 2,087  
Foreign Currency Transaction Gain (Loss), before Tax 98 268 347  
Provision for Doubtful Accounts 700      
Cash and Cash Equivalents, at Carrying Value 5,536 8,503 6,099 $ 5,447
Cost of Sales [Member]        
Unrealized Gain (Loss) on Derivatives 918 831 616  
Gain (Loss) on Sale of Derivatives $ (116) $ (2,803) $ (4,446)  
Base Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate 0.80%      
Base Rate [Member] | Term Loan [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.30%      
PNC Bank [Member]        
Long-term Debt $ 10,000      
PNC Bank [Member] | Term Loan [Member]        
Line of Credit Facility, Interest Rate at Period End 5.80%      
PNC Bank [Member] | Base Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.25%      
Revolving Credit Facility [Member] | PNC Bank [Member]        
Debt, Weighted Average Interest Rate 4.90% 4.20%    
Line of Credit Facility, Interest Rate at Period End 5.30%      
Line of Credit Facility, Remaining Borrowing Capacity $ 5,295 $ 7,377    
Line of Credit Facility, Maximum Borrowing Capacity $ 30,000      
Revolving Credit Facility [Member] | PNC Bank [Member] | Base Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate 0.75%