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Note 8 - Guarantees and Other Obligations (Details Textual)
SFr in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
CHF (SFr)
Dec. 30, 2017
USD ($)
Loans Payable to Bank, Current $ 1,185   $ 1,280 [1]
Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | Long-term Borrowings Assumed in Business Acquisition [Member]      
Long-term Debt, Total 5,300    
Loans Payable to Bank, Current 1,200    
Revolving Credit Facility [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 6,300    
Long-term Line of Credit, Total 3,200    
Line of Credit Available to Ismeca Subsidiary [Member]      
Line of Credit Facility, Maximum Borrowing Capacity | SFr   SFr 2,000  
Long-term Line of Credit, Total   SFr 0 0
Non-current Other Accrued Liabilities [Member]      
Product Warranty Accrual, Noncurrent $ 500   $ 600
Minimum [Member]      
Standard Product Warranty Term 1 year    
Minimum [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | Long-term Borrowings Assumed in Business Acquisition [Member]      
Debt Instrument, Interest Rate, Stated Percentage 0.05% 0.05%  
Maximum [Member]      
Standard Product Warranty Term 3 years    
Maximum [Member] | Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member] | Long-term Borrowings Assumed in Business Acquisition [Member]      
Debt Instrument, Interest Rate, Stated Percentage 0.45% 0.45%  
[1] Derived from December 30, 2017 audited financial statements