Note 6 - Goodwill, In-process Research and Development and Other Intangible Assets - Summary of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Balance, Goodwill	$ 17,847	$ 13,074
Amortization expense
Balance, Goodwill	17,847	17,847
Balance, Finite-lived Intangible Assets	5,947
Increase related to Somerset acquisition		4,773
In Process Research and Development [Member]
Balance, Finite-lived Intangible Assets	600	600
Amortization expense, Finite-lived Intangible Assets
Balance, Finite-lived Intangible Assets	600	600
Increase related to Somerset acquisition
Other Intangible Assets [Member]
Balance, Finite-lived Intangible Assets	6,223	6,066
Amortization expense, Finite-lived Intangible Assets	(276)	(260)
Balance, Finite-lived Intangible Assets	$ 5,947	7,051
Increase related to Somerset acquisition		$ 1,245

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

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

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