Note 4 - Business Combination (Details Textual) - USD ($) $ in Thousands	Dec. 03, 2019	Jun. 30, 2020	Dec. 31, 2019
Business Combination, Contingent Consideration, Liability, Total		$ 5,948	$ 6,088
Goodwill, Ending Balance		2,725	2,725
NanoString [Member]
Payments to Acquire Businesses, Gross	$ 40,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	10,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	10,000
Business Combination, Contingent Consideration, Liability, Total	6,100	$ 5,900	$ 6,100
Goodwill, Ending Balance	$ 1,668

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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