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Note 2 - Supplemental Balance Sheet Information - Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Goodwill | $ 780 | $ 780
Customer Relationships [Member] |  |
Gross carrying amount | 906 | 906
Accumulated amortization | (780) | (690)
Computer Software, Intangible Asset [Member] |  |
Gross carrying amount | 234 | 234
Accumulated amortization | $ (234) | $ (234)

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