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Note 3 - Supplemental Balance Sheet Information (in Thousands) - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Gross, Total	$ 5,021	$ 5,021
Less accumulated amortization	(2,766)	(2,225)
Intangible assets, net	2,255	2,796
Customer Contracts And Lists [Member]
Finite-Lived Intangible Assets, Gross, Total	2,731	2,731
Trade Names [Member]
Finite-Lived Intangible Assets, Gross, Total	900	900
Patents [Member]
Finite-Lived Intangible Assets, Gross, Total	870	870
Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Gross, Total	$ 520	$ 520

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

+ References

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