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Note 6 - Shareholders' Equity (Details Textual) - USD ($)		3 Months Ended						9 Months Ended
	Aug. 13, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)								585,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)								$ 1.68	$ 1.88
Treasury Stock, Common, Shares (in shares)		12,253,502						12,253,502		12,253,502
Treasury Stock, Value, Ending Balance		$ 18,929,915						$ 18,929,915		$ 18,929,915
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 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)		0	525,000	60,000	0	23,000	100,000	585,000	123,000

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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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