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Note 2 - Supplemental Balance-sheet Information - Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Goodwill | $ 1,907 | $ 1,907
Customer Relationships [Member] |  |
Gross carrying amount | 906 | 906
Accumulated amortization | (418) | (327)
Computer Software, Intangible Asset [Member] |  |
Gross carrying amount | 234 | 234
Accumulated amortization | (216) | (169)
Trade Names [Member] |  |
Gross carrying amount | 60 | 60
Accumulated amortization | $ (5) |

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