Note 2 - Acquisitions and Divestitures (Details Textual) $ in Thousands, € in Millions							2 Months Ended	3 Months Ended									12 Months Ended
	Oct. 22, 2018 USD ($)	Oct. 22, 2018 EUR (€)	Sep. 20, 2018 USD ($)	Apr. 05, 2018 USD ($)	Nov. 10, 2016 USD ($)	Mar. 18, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 22, 2018 EUR (€)	May 31, 2018 USD ($)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life																	9 years 182 days
Revenue from Contract with Customer, Including Assessed Tax								$ 28,389		$ 24,165	$ 27,020	$ 25,994	$ 26,153	$ 24,822	$ 25,753	$ 24,139	$ 105,568	$ 100,867	$ 89,151
Reddick Divestiture [Member]
Proceeds from Sale of Productive Assets, Total				$ 7,400
Long-term Purchase Commitment, Period				2 years
Gain (Loss) on Disposition of Assets for Financial Service Operations, Total				$ 5,900
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax																	$ 59,078	$ 58,470	$ 50,439
Cardial [Member]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual							$ 1,100
Business Combination, Consideration Transferred, Total	$ 2,300	€ 2.0
Payments to Acquire Businesses, Gross	1,300	1.1
Business Combination, Consideration Transferred, Liabilities Incurred	500	0.5
Business Combination, Deferred Purchase Consideration	400																			€ 0.4
Deferred Tax Assets, Business Combinations	600																			€ 0.5
Business Combination, Bargain Purchase, Gain Recognized, Amount	$ 1,600	€ 1.4
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 years 146 days	9 years 146 days
Applied Medical [Member]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual									$ 800
Business Combination, Consideration Transferred, Total			$ 14,200
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			13 years
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Current Assets Deferred Costs			$ 3,200
Acquisition Date Fair Value			$ 3,043
Business Combination ,Fair Value Inputs, Discount Rate			3.75%
Business Acquisition, Purchase Price Allocation, Goodwill Expected Tax Deductible, Period			15 years
Applied Medical [Member] | Closing Date [Member]
Business Combination, Consideration Transferred, Total			$ 11,000
Applied Medical [Member] | 12 Months Following the Closing Date [Member]
Business Combination, Consideration Transferred, Total			2,000
Applied Medical [Member] | 24 Months Following the Closing Date [Member]
Business Combination, Consideration Transferred, Total			$ 1,200
Applied Medical [Member] | UNITED STATES
Percentage of Sales by Major Product Lines			60.00%
Applied Medical [Member] | Foreign [Member]
Percentage of Sales by Major Product Lines			40.00%
Balloon Supply Agreement [Member] | Reddick Divestiture [Member]
Long-term Purchase Commitment, Period				6 years
Restore Flow Allografts [Member]
Business Combination, Consideration Transferred, Total					$ 12,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					10 years 109 days
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Current Assets Deferred Costs					$ 2,583
Business Acquisition, Purchase Price Allocation, Goodwill Expected Tax Deductible, Period					15 years
Business Combination, Contingent Consideration, Liability, Total					$ 900																$ 2,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High					$ 6,000
Estimated Weighted Average Cost of Capital					14.10%
Restore Flow Allografts [Member] | Non-employee Investors [Member]
Acquisition Date Fair Value					$ 900
Business Combination, Contingent Consideration, Liability, Total					1,100
Restore Flow Allografts [Member] | Contingency One [Member]
Business Combination, Contingent Consideration, Liability, Total					2,000
Restore Flow Allografts [Member] | Earn-outs Payment One [Member] | Minimum [Member]
Revenue from Contract with Customer, Including Assessed Tax					6,000
Restore Flow Allografts [Member] | Earn-outs Payment Two [Member] | Minimum [Member]
Revenue from Contract with Customer, Including Assessed Tax					9,000
Restore Flow Allografts [Member] | Earn-outs Payment Two [Member] | Maximum [Member]
Business Combination, Contingent Consideration, Liability, Total					2,000
Restore Flow Allografts [Member] | Combined Earn-out Payment [Member]
Acquisition Date Fair Value					$ 100
ProCol Biologic Graft [Member]
Business Combination, Consideration Transferred, Total						$ 2,700
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						8 years 219 days
Business Acquisition, Purchase Price Allocation, Goodwill Expected Tax Deductible, Period						15 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other						$ 2,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets						$ 700
Percentage of Payment Made for Assets Acquired						50.00%
Business Combination Contingent Consideration Measurement as Percentage of Revenue						10.00%
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred						$ 300