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Note 10 - Goodwill, In-process Research and Development and Intellectual Property (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
Sep. 21, 2015
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Sep. 23, 2018
USD ($)
Sep. 03, 2013
USD ($)
Goodwill, Ending Balance       $ 0     $ 0   $ 80,131    
Goodwill, Impairment Loss     $ 79,000   $ 0 $ 0 78,969 $ 61,700      
Number of Reporting Units         1            
Impairment of Intangible Assets, Finite-lived         $ 0 0 7,912        
Intellectual Property [Member]                      
Impairment of Intangible Assets, Finite-lived         $ 0 $ 0 $ 0        
Developed Technology Rights [Member] | Weighted Average [Member]                      
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)         1 year 7 months 6 days            
Technology-Based Intangible Assets [Member] | Weighted Average [Member]                      
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)         5 years 3 months 18 days            
In Process Research and Development [Member]                      
Impairment of Intangible Assets, Finite-lived       $ 7,900              
Safe Stitch Medical Inc [Member]                      
Goodwill, Ending Balance                     $ 93,800
Senhance Surgical Robotic System Acquisition[Member]                      
Goodwill, Ending Balance   $ 38,300                  
Senhance Surgical Robotic System Acquisition[Member] | Intellectual Property [Member]                      
Intangible Assets, Net (Excluding Goodwill), Total   $ 17,100                  
Discount Rate Used in Discounted Cash Flows   45.00%                  
Medical Surgery Technologies Limited [Member]                      
Goodwill, Ending Balance                   $ 9,600  
Medical Surgery Technologies Limited [Member] | In Process Research and Development [Member]                      
Intangible Assets, Net (Excluding Goodwill), Total $ 10,600                    
Discount Rate Used in Discounted Cash Flows 15.00%