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Note 13 - Equity-based Compensation (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2017 | Oct. 31, 2007 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  |  |  | 0 | 0 | 0 | 0
Proceeds from Stock Options Exercised |  |  |  | $ 0 | $ 0 | $ 0 | $ 0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  | 300 |  | $ 300 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 2 years 1 month 6 days |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  | 42,000 |
Share-Based Payment Arrangement, Expense |  |  |  | 62 | (208) | $ 201 | $ 130
Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  | 36,000 | 0
Employees and Directors [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  | 6,150 | 17,892
Share-Based Payment Arrangement, Expense |  |  |  | 62 | 208 | $ 201 | $ 130
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  | $ 3 | $ 0 | $ 7 |
Restricted Stock [Member] | Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 0 |
Restricted Stock [Member] | Employees and Directors [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 5,148 | 5,148
The 2007 Omnibus Incentive Plan [Member] | Maximum [Member] | Incentive Stock Options (ISOs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  | 10 years |  |  |  |
The 2017 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  | 66,243 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Shares Authorized, Percentage of Outstanding Common Stock |  | 4.00% |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) | 81,417 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 147,905 |  | 147,905 |
The 2017 Omnibus Incentive Plan [Member] | Incentive Stock Options (ISOs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percentage of Stock Owned by Shareholder, Minimum |  | 10.00% |  |  |  |  |
The 2017 Omnibus Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 4 years |  |  |  |  |
The 2017 Omnibus Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 10 years |  |  |  |  |
The 2017 Omnibus Incentive Plan [Member] | Maximum [Member] | Incentive Stock Options (ISOs) [Member] | Shareholder of More Than 10% [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 5 years |  |  |  |  |
The 2017 Omnibus Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  | 100.00% |  |  |  |  |
The 2017 Omnibus Incentive Plan [Member] | Minimum [Member] | Incentive Stock Options (ISOs) [Member] | Shareholder of More Than 10% [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  | 110.00% |  |  |  |  |

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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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