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Note 8 - Guarantees and Other Obligations (Details Textual)
$ in Thousands, SFr in Millions
6 Months Ended
Jun. 24, 2017
USD ($)
Jun. 24, 2017
CHF (SFr)
Dec. 31, 2016
USD ($)
Long-term Line of Credit $ 0   $ 0
Loans Payable to Bank 6,700    
Loans Payable to Bank, Current 1,409   [1]
Line of Credit Facility, Maximum Borrowing Capacity | SFr   SFr 2.5  
Revolving Credit Facility [Member]      
Long-term Line of Credit 3,200    
Line of Credit Facility, Maximum Borrowing Capacity 6,300    
Standby Letters of Credit [Member]      
Long-term Line of Credit 0    
Non-current Other Accrued Liabilities [Member]      
Product Warranty Accrual, Noncurrent $ 700   $ 600
Minimum [Member]      
Standard Product Warranty Term 1 year    
Minimum [Member] | Long-term Borrowings Assumed in Business Acquisition [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]      
Debt Instrument, Interest Rate, Stated Percentage 0.05% 0.05%  
Maximum [Member]      
Standard Product Warranty Term 3 years    
Maximum [Member] | Long-term Borrowings Assumed in Business Acquisition [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]      
Debt Instrument, Interest Rate, Stated Percentage 1.43% 1.43%  
[1] Derived from December 31, 2016 audited financial statements