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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 27 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | May 31, 2022 | Jan. 01, 2023 | Dec. 31, 2021 | May 31, 2017
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  | 3,000 | 54,000 | 90,000 |  |  |  |  |  |
Weighted Average Number of Shares Outstanding, Diluted, Adjustment | 150,783 | 212,643 | 171,723 | 202,479 |  |  |  |  |  |
Letters of Credit Outstanding, Amount | $ 300 |  | $ 300 |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents, Current | $ 422 | $ 792 | $ 422 | $ 792 | $ 1,454 | [1] |  |  |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 1 year 1 month 6 days |  | 1 year 1 month 6 days |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net | $ 303 |  | $ 303 |  | 422 | [1] |  |  | $ 501 |
Amortization of Intangible Assets | 39 | $ 40 | 119 | $ 111 | 150 |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Current | 316 |  | 316 |  | 334 |  |  |  |  |
Retained Earnings (Accumulated Deficit) | (14,318) |  | (14,318) |  | $ (11,826) | [1] |  |  |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Current |  |  |  |  |  |  |  | $ 30 |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  | $ 30 |  |
Patents Received [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net | 85 |  | 85 |  |  |  |  |  |  |
Patents In Process [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net | $ 110 |  | $ 110 |  |  |  |  |  |  |
Service-based Options [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 25,000 | 3,000 | 54,000 | 69,000 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 6.13 |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 5.88 |  |  |  |  |  |  |
Market Condition Options [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 0 | 0 | 0 | 21,000 |  |  |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ 42 | $ 62 | $ 184 | $ 168 |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 724 |  | $ 724 |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 3 years 9 months 18 days |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 47,538 | 34,211 | 37,869 | 44,070 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 9.37 |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ 38 | $ 31 | $ 115 | $ 66 |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 154 |  | $ 154 |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 1 year 2 months 12 days |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 18,000 |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 16,784 |  | 15,027 |  |  |  |  |  |  |
Stock Incentive Plan 2017 [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  | 350,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized |  |  |  |  |  |  | 325,000 |  |  |
Stock Incentive Plan 2017 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 9.37 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period | 0 |  |  |  |  |  |  |  |  |
Stock Incentive Plan 2017 [Member] | Restricted Stock Units (RSUs) [Member] | Non-employee Directors [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 0 | 18,000 | 21,000 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  | 2 years | 2 years |  |  |  |  |  |
[1] | The balance sheet at December 31, 2022 has been derived from the audited financial statements at that date

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