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Note 1 - Summary of Significant Accounting Policies - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Balance |  |  | $ 422 | [1] | $ 501 | $ 501 |
Additions |  |  |  |  |  | 71 |
Amortization | $ 39 | $ 40 | 119 |  | 111 | 150 |
Balance | 303 |  | 303 |  |  | 422 | [1]
Customer Relationships [Member] |  |  |  |  |  |  |
Balance |  |  | 216 |  | 360 | 360 |
Additions |  |  |  |  |  | 0 |
Amortization |  |  | 108 |  |  | 144 |
Balance | 108 |  | 108 |  |  | 216 |
Patents [Member] |  |  |  |  |  |  |
Balance |  |  | 206 |  | $ 141 | 141 |
Additions |  |  |  |  |  | 71 |
Amortization |  |  | 11 |  |  | 6 |
Balance | $ 195 |  | $ 195 |  |  | $ 206 |
[1] | The balance sheet at December 31, 2022 has been derived from the audited financial statements at that date

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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