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Note 8 - Guarantees and Other Obligations (Details Textual)
$ in Thousands, SFr in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
CHF (SFr)
Dec. 31, 2016
USD ($)
Line of Credit Facility, Maximum Borrowing Capacity | SFr   SFr 2.5  
Long-term Line of Credit $ 0   $ 0
Loans Payable to Bank 6,200    
Loans Payable to Bank, Current 1,300   [1]
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 6,200    
Long-term Line of Credit 3,100    
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 0.45% 0.45%  
[1] Derived from December 31, 2016 audited financial statements