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Note 5 - Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2022
Notes to Financial Statements |
Goodwill and Intangible Assets Disclosure [Text Block] |
6. | Goodwill and Intangible Assets
Management evaluates goodwill for impairment on an annual basis (fourth quarter), and no impairment charge was identified for the years presented. Definite-lived intangible assets, consisting of patents and trademarks, are amortized over their useful lives. Intangible assets consisted of the following:
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | Weighted Average Amortization Period (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Amortization Period (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Patents and Trademarks |  |  | 1.0 |  |  | $ | 474,000 |  |  | $ | (473,000 | ) |  | $ | 1,000 |  |  |  | 2.0 |  |  | $ | 474,000 |  |  | $ | (471,000 | ) |  | $ | 3,000 |
Amortization expense for intangible assets was $2,000 and $4,000 for the years ended December 31, 2022 and 2021, respectively. Estimated future amortization expense related to definite-lived intangible assets is $1,000 for the year ending December 31, 2023.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI https://asc.fasb.org/topic&trid=2144416 + Details
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