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Note 6 - Shareholders' Equity (Details Textual) - USD ($)		3 Months Ended				6 Months Ended
	Aug. 13, 2020	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 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)		525,000	60,000	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 previously issued common shares repurchased by the issuing entity and held in treasury.

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