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Note 7 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Gross Carrying Amount |  | $ 2,710 | $ 3,848
Accumulated Amortization |  | (1,157) | (1,945)
Intangible Assets, Net |  | 1,553 | 1,903
Customer Relationships [Member] |  |  |
Gross Carrying Amount |  | 1,378 | 1,378
Accumulated Amortization |  | (689) | (551)
Intangible Assets, Net |  | 689 | 827
Trademarks and Trade Names [Member] |  |  |
Gross Carrying Amount |  | 1,132 | 1,132
Accumulated Amortization |  | (377) | (302)
Intangible Assets, Net |  | 755 | 830
Backlog [Member] |  |  |
Gross Carrying Amount | [1] | 200 |
Accumulated Amortization | [1] | (91) |
Intangible Assets, Net | [1] | $ 109 |
Patents [Member] |  |  |
Gross Carrying Amount |  |  | 1,162
Accumulated Amortization |  |  | (929)
Intangible Assets, Net |  |  | 233
Other Intangible Assets [Member] |  |  |
Gross Carrying Amount | [2] |  | 176
Accumulated Amortization | [2] |  | (163)
Intangible Assets, Net | [2] |  | $ 13
[1] | Backlog, included in the July 2018 acquisition of Ameron, has a weighted-average amortization period of eleven months.
[2] | Other intangibles consist of favorable lease contracts and non-compete agreements.

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