Note 6 - Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Amortization of Intangible Assets, Total	$ 1,300	$ 300
Impairment of Intangible Assets, Finite-lived	318	$ 281	$ 389
Asset Impairment Charges, Total	0
Parcus Medical and Arthrosurface [Member]
Finite-lived Intangible Assets Acquired	92,900
Parcus Medical and Arthrosurface [Member] \| Selling, General and Administrative Expenses [Member]
Impairment of Intangible Assets, Finite-lived	$ 300

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

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