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Note 4 - Business Combinations - Allocation of Purchase Prices for the Acquisition of Alphaform (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liabilities assumed:        
Payments to Acquire Businesses, Net of Cash Acquired   $ 110,533 $ 5,032
Business Combination, Bargain Purchase, Gain Recognized, Amount   344
Alphaform A.G. [Member]        
Assets acquired:        
Current assets       2,766
Other long-term assets       3,876
Total assets acquired       6,642
Liabilities assumed:        
Current liabilities       1,266
Total liabilities assumed       1,266
Net assets acquired       5,376
Cash paid       5,570
Cash acquired       (538)
Payments to Acquire Businesses, Net of Cash Acquired $ 5,000     5,032
Business Combination, Bargain Purchase, Gain Recognized, Amount       $ 344