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Note 6 - Shareholders' Equity (Details Textual) - USD ($)			3 Months Ended
		Aug. 13, 2020	Mar. 31, 2021		Mar. 31, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)	[1]		60,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)			$ 1.93	[1]	$ 1.78
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)			60,000		100,000
[1] Represents the following stock options exercised: A total of 60,000 stock options exercised with a weighted average exercise price of $1.93.

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- Definition

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+ References

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- Definition

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Face amount or stated value per share of common stock.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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