Note 4 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Fully Amortized Intangible Assets, Retired	$ 3,500
Finite-Lived Intangible Assets, Gross, Total	65,679	$ 67,023
Impairment of Intangible Assets (Excluding Goodwill), Total	0
Asset Impairment Charges, Total	0	1,460
Restructuring Charges, Total	2,033	1,354
Other Asset Impairment Charges		100
Amortization of Intangible Assets, Total	5,710	5,746
Facility Closing [Member]
Restructuring Charges, Total		500
Indefinite-Lived Trade Names Reclassified to Finite-Lived [Member]
Finite-Lived Intangible Assets, Gross, Total	$ 900
In Process Research and Development [Member]
Impairment of Intangible Assets (Excluding Goodwill), Total		$ 900

The amount of fully amortized intangible assets retired during period.

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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 before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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