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Note 11 - Stock Compensation Plans - Summary of Stock Options (Details) - shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Options granted (in shares) |  | 0 | 0
Options, vested and exercisable (in shares) |  | 59,000 |
Options, non-vested (in shares) |  | 0 |
All Plans [Member] |  |  |
Options granted (in shares) |  | 1,380,152 |
Options exercised (in shares) |  | 1,014,820 |
Options cancelled (in shares) |  | 282,680 |
The 2003 Plan [Member] |  |  |
Options exercised (in shares) | [1],[2] | 0 | 0
Options expired (in shares) | [1],[2] | 0 | 0
Options cancelled (in shares) | [1],[2] | 0 | 0
The 2015 Plan [Member] |  |  |
Options granted (in shares) | [1],[3] | 0 | 0
Options exercised (in shares) | [1],[3] | 0 | 0
Options expired (in shares) | [1],[3] | 0 | 0
Options cancelled (in shares) | [1],[3] | 0 | 0
The Directors Plan [Member] |  |  |
Options exercised (in shares) | [1],[4] | 0 | 0
Options expired (in shares) | [1],[4] | 0 | 0
Options cancelled (in shares) | [1],[4] | 0 | 0
The 2011 Non-employee Director Stock Option Plan [Member] |  |  |
Options exercised (in shares) | [1],[5] | 0 | 0
Options expired (in shares) | [1],[5] | 0 | 0
Options cancelled (in shares) | [1],[5] | 0 | 0
The 2020 Non-employee Director Stock Option Plan [Member] |  |  |
Options granted (in shares) | [1],[6],[7] | 6,021 | 8,808
The 2022 Stock Plan [Member] |  |  |
Options granted (in shares) | [1],[6],[8] | 0 | 0
Options exercised (in shares) | [1],[6],[8] | 0 | 0
Options expired (in shares) | [1],[6],[8] | 0 | 0
Options cancelled (in shares) | [1],[6],[8] | 0 | 0
[1] | Indicates plans with stock options.
[2] | The 2003 Stock Incentive Plan (the “2003 Plan”) was instituted in March 2003. The 2003 Plan authorized the issuance of up to 450,000 options to purchase shares of common stock to officers and key employees, with vesting of such options occurring equally over a 3-year time period. In 2013, the 2003 Plan expired with 197,500 options ungranted.
[3] | The 2015 Incentive Stock Plan (the “2015 Plan”) was approved by shareholders in June 2015, which authorizes the issuance of up to 750,000 options to purchase shares of common stock to employees and key consultants and advisors.
[4] | The Non-Employee Directors’ Stock Option Plan (the “Directors Plan”) was instituted in August 2000 that authorized the issuance of up to 200,000 options to purchase shares of common stock to non-employee directors. Upon adoption of the Directors Plan, each non-employee director was granted an option to acquire 5,000 shares. At each Annual Meeting, each director received a grant of 4,000 options, which vest in 50% increments on the first and second anniversary. The Directors Plan expired in 2011, with 60,000 options ungranted.
[5] | The 2011 Non-Employee Directors Stock Plan (the “2011 Directors Plan”) was approved by shareholders in May 2011 with essentially the same terms and conditions as the Directors Plan.
[6] | Indicates plans with stock grants.
[7] | The 2020 Non-Employee Directors’ Stock Incentive Plan (the “2020 Plan”) was approved by shareholders in August 2020, which replaces the 2011 Director Plan and authorizes the issuance of 200,000 shares of common stock to non-employee directors. We expect to grant each independent director $50,000 of stock on the date of each subsequent Annual Meeting.
[8] | In May 2022, shareholders approved the 2022 Employee Stock Incentive Plan (the “2022 Plan”), which replaces the 2015 Plan and authorizes the issuance of 750,000 shares of common stock to employees. No shares have been granted under the plan as of December 31, 2023.

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -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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