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Note 10 - Stock Compensation Plans (Details Textual) - USD ($) | 1 Months Ended | 5 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2000 | Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | May 31, 2022 | Aug. 31, 2020 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2013 | Aug. 31, 2000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  | $ 0 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 0 | 0 |  |  |  |  |  |
The 2003 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  | 450,000 |  |  |
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted |  |  |  |  |  |  |  |  |  | 197,500 |
The 2015 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  | 750,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | [1],[2] |  |  | 0 | 0 |  |  |  |  |  |
The Directors Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  |  | 200,000
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted |  | 60,000 |  |  |  |  |  |  |  |  |
Number Of Options Each Director Received At Each Annual Meeting |  | 4,000 |  |  |  |  |  |  |  |  |
Options Vesting Percentage On First And Second Anniversary |  | 50.00% |  |  |  |  |  |  |  |  |
The Directors Plan [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  | 5,000 |  |  |  |  |  |  |  |  |
The 2011 Non-employee Director Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 200,000 |  |  |  |
Three Independent Members of the Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement, Stock to be Granted Per Recipient, Value |  |  | $ 50,000 |  |  |  |  |  |  |  |
The 2022 Stock Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  |  | 750,000 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | [1],[3],[4] |  |  | 0 | 0 |  |  |  |  |  |
[1] | Indicates plans with stock options.
[2] | 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.
[3] | 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, 2022.
[4] | Indicates plans with stock grants.

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