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Note 12 - Stock-based Compensation Stock (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) shares | Jan. 01, 2024 shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 310,996 |
Executive Officer [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 39,721 |
Share-Based Payment Arrangement, Option [Member] |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ | $ 2,000,000 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 2 years 1 month 6 days |
Stock Option Vesting Terms As Improbable to probable [Member] |  |
Share-Based Payment Arrangement, Plan Modification, Incremental Cost | $ | $ 300,000 |
Stock Option Vesting Terms As Probable to probable [Member] |  |
Share-Based Payment Arrangement, Accelerated Cost | $ | $ 12,000 |
Equity Incentive Plan 2015 [Member] |  |
Percentage of Total Shares Eligible for Plan Reserve, On an Annual Basis | 4.00% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant | 23,843 | 348,109
The 2018 Employee, Director and Consultant Equity Incentive Plan [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant | 0 |
The 2018 Employee, Director and Consultant Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period | 10 years |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period | 4 years |
The 2018 Employee, Director and Consultant Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period | 1 year |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage | 25.00% |
Inducement Options [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period | 10 years |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period | 36 months |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 71,712 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Employees | 5 |

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- Definition The percentage of total shares within the plan that may be added to the plan reserve, occurring on an annual basis. + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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