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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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