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Note 10 - Stock-based Compensation Plan (Details Textual) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 08, 2023 | Mar. 09, 2022 | Oct. 01, 2021 | Jun. 14, 2021 | Mar. 10, 2021 | Aug. 24, 2020 | Aug. 31, 2020 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  | $ 4,537 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  | 2 years 3 months 18 days |  |  |
Share-based Payment Arrangement, Amount Capitalized |  |  |  |  |  |  |  |  | $ 0 | $ 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  |  |  | $ 9.32 | $ 5.19 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  |  |  |  | $ 381,000 | $ 188,000 |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  |  |  | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  |  | 4 years |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  | 90,588 |  |  |
Restricted Stock [Member] | Vesting Based On Performance Metrics [Member] | Restricted Stock Vesting in Three Years [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  | 100.00% |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  |  |  |  |  | 0.00% |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  |  |  |  | 150.00% |  |  | 150.00% |
Restricted Stock [Member] | Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  |  | 4 years |
Restricted Stock [Member] | Independent Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  |  | 1 year |
Restricted Stock [Member] | Independent Directors [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  | 25.00% |
Restricted Stock [Member] | President [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 141,610 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value |  |  |  |  |  | $ 650,000 |  |  |  |  |
Restricted Stock [Member] | President [Member] | Restricted Stock Vesting in Three Years [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 75,162 |  |  |  |  |
Restricted Stock [Member] | President [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 4 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 66,448 |  |  |  |  |
Restricted Stock [Member] | President [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Restricted Stock Vesting in Three Years [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  |  |  |  | 0.00% |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  |  |  | 150.00% |  |  |  |  |
Restricted Stock [Member] | President [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  | 25.00% |  |  |  |  |
Restricted Stock [Member] | Members of The Senior Management [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 5,000 |  | 18,000 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expected to Forfeit, Outstanding, Number (in shares) |  |  |  |  |  |  |  |  |  | 6,000 |
Restricted Stock [Member] | Members of The Senior Management [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  | 100.00% |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  |  |  | 0.00% |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  |  | 150.00% |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) |  |  |  |  |  |  |  |  |  | 12,000 |
Restricted Stock [Member] | Members of The Senior Management [Member] | Vesting Based On Performance Metrics [Member] | Restricted Stock Vesting on January 1, 2025 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  | 100.00%
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  | 0.00% |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  | 150.00% |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 7,941 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value |  |  |  | $ 133,000 |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 4 years |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 1,988 |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Restricted Stock Vesting on August 24, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  |  | 0.00% |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  | 150.00% |  |  |  |  |  | 150.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 5,953 |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 3 years |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 100.00% |  |  |  |  |  |  |  |  | 100.00% |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range | 0.00% | 0.00% |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range | 150.00% | 150.00% |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 18,888 | 20,493 |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Value | $ 303 | $ 200,000 |  |  |  |  |  |  |  |  |

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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 The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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