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Note 3 - Acquisitions (Details Textual) $ in Thousands, € in Millions								3 Months Ended		9 Months Ended			12 Months Ended
	Oct. 15, 2019 USD ($)	Aug. 07, 2019 USD ($) shares	Oct. 31, 2018 USD ($) shares	Dec. 30, 2016 USD ($) shares	Dec. 30, 2016 EUR (€) shares	Sep. 21, 2015 USD ($) shares	Sep. 21, 2015 EUR (€) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2020 EUR (€)
Gain (Loss) on Disposition of Assets, Total								$ (0)	$ (0)	$ (0)		$ (97)
Business Combination, Contingent Consideration, Liability, Total								2,780		2,780			$ 1,084
Auto Lap [Member]
Disposal Group, Including Discontinued Operation, Consideration	$ 17,000
Proceeds from Sale of Productive Assets, Total	16,000
Disposal Group Including Discontinued Operation Consideration Receivable	$ 1,000
Gain (Loss) on Disposition of Assets, Total													16,000
Medical Surgery Technologies Limited [Member]
Payments to Acquire Businesses, Gross			$ 5,800
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) \| shares		370,423	242,310
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		$ 6,600
Senhance Surgical Robotic System Acquisition [Member]
Payments to Acquire Businesses, Gross				$ 25,000	€ 22.5	$ 25,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) \| shares				286,360	286,360	1,195,647	1,195,647
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable \| €					€ 5.0
Business Combination, Consideration Transferred, Liabilities Incurred \| €							€ 27.5
Business Combination, Contingent Consideration, Liability, Total								$ 2,800		$ 2,800			$ 1,100
Senhance Surgical Robotic System Acquisition [Member] \| Second Tranche [Member]
Business Combination, Contingent Consideration, Liability, Total \| €														€ 15.0
Senhance Surgical Robotic System Acquisition [Member] \| Third Tranche [Member]
Business Combination, Contingent Consideration, Liability, Total \| €														€ 15.0
Senhance Surgical Robotic System Acquisition [Member] \| Third Tranche [Member] \| Minimum [Member]
Business Combination Contingent Consideration Arrangements Target Revenue \| €											€ 25.0
Senhance Surgical Robotic System Acquisition [Member] \| Fourth Tranche [Member]
Business Combination, Contingent Consideration, Liability, Total \| €							€ 2.5