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Note 7 - Shareholders' Equity (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 13, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  | 135,000 | [1] | 781,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) |  | $ 1.89 | [1] | $ 1.60
Treasury Stock, Common, Shares (in shares) |  | 12,253,502 |  | 12,253,502
Treasury Stock, Value, Ending Balance |  | $ 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) |  | 135,000 |  | 645,671
[1] | Represents the following stock options exercised: A total of 135,000 stock options exercised with a weighted average market price of $1.89.

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