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Note 4 - Business Combinations (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2017
Oct. 01, 2015
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Payments to Acquire Businesses, Net of Cash Acquired       $ 110,533 $ 5,032
Goodwill     $ 128,504 128,504 28,916 28,916
Share-based Compensation       8,558 6,775 6,082
Business Combination, Bargain Purchase, Gain Recognized, Amount       344
Trade Names [Member]            
Finite-Lived Intangible Asset, Useful Life       2 years    
Rapid [Member]            
Business Combination, Consideration Transferred $ 121,869          
Payments to Acquire Businesses, Net of Cash Acquired 110,533          
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 11,336          
Goodwill $ 99,588          
Business Acquisition, Goodwill, Expected Tax Deductible Period 15 years          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years 182 days          
Business Combination, Acquisition Related Costs       $ 1,900    
Business Acquisition, Increase (Decrease) in Depreciation Expense       (900) (600)  
Amortization       $ 3,000 3,100  
Share-based Compensation         $ 200  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     3,600      
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual     $ (700)      
Rapid [Member] | Employees [Member]            
Payments to Employees $ 1,100          
Rapid [Member] | Customer Relationships [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 7,500          
Finite-Lived Intangible Asset, Useful Life 6 years          
Rapid [Member] | Trade Names [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 1,100          
Finite-Lived Intangible Asset, Useful Life 2 years          
Rapid [Member] | Noncompete Agreements [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 100          
Finite-Lived Intangible Asset, Useful Life 5 years          
Alphaform A.G. [Member]            
Payments to Acquire Businesses, Net of Cash Acquired   $ 5,000       5,032
Business Combination, Bargain Purchase, Gain Recognized, Amount           344
Alphaform A.G. [Member] | Other Income [Member]            
Business Combination, Bargain Purchase, Gain Recognized, Amount           $ 300