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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Note 6 - Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Amortization of Intangible Assets, Total	$ 1,900		$ 300		$ 5,400	$ 800
Impairment of Intangible Assets, Finite-lived					$ 1,025	$ 303	$ (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				$ 1,000