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Note 3 - Supplemental Balance Sheet Information (in Thousands) - Intangible Assets (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets, Gross, Total | $ 5,000,000 |
Less accumulated amortization | (1,638,000) | $ (2,381,000)
Intangible assets, net | 3,332,000 | 1,634,000
Customer Contracts And Lists [Member] |  |
Finite-Lived Intangible Assets, Gross, Total | 2,680,000 | 4,015,000
Trade Names [Member] |  |
Finite-Lived Intangible Assets, Gross, Total | 900,000 |
Patents [Member] |  |
Finite-Lived Intangible Assets, Gross, Total | 870,000 |
Noncompete Agreements [Member] |  |
Finite-Lived Intangible Assets, Gross, Total | $ 520,000 |

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