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Note 7 - Shareholders' Equity (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 13, 2020 | Dec. 31, 2022 | Dec. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  | 333,943 | [1] | 735,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) |  | $ 1.63 |  | $ 1.67
Treasury Stock, Common, Shares (in shares) |  | 12,253,502 |  | 12,253,502
Treasury Stock, Value, Total |  | $ 18,929,915 |  | $ 18,929,915
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 | $ 0.001 |  | $ 0.001
Open Market Sale Agreement [Member] |  |  |  |
Sale of Stock, Authorized Offering Amount | $ 50,000,000.0 |  |  |
Sale of Stock, Percentage of Commissions Paid of Gross Proceeds From Sale Of Each Share | 3.00% |  |  |
Sale of Stock, Reimbursable Legal Expenses | $ 50,000 |  |  |
Sale of Stock, Termination Amount Under Agreement | $ 50,000,000.0 |  |  |
Common Stock [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  | 333,943 |  | 735,000
[1] | Represents the following stock options exercised: • 150,000 stock options exercised at $1.87, 40,000 stock options exercised at $1.63, 8,943 stock options exercised at $1.57, and 50,000 stock options exercised at $1.44, 50,000 stock options exercised at $1.39, and 35,000 stock options exercised at $1.21.

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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