Represents authorized offering amount of sale of stock.

No definition available.

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- Definition

Represents percentage of commission paid on gross proceeds from sale of each share

+ References

No definition available.

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- Definition

Represents reimbursable legal expense for sale of stock.

+ References

No definition available.

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- Definition

Represents termination amount under agreement for sale of stock.

+ References

No definition available.

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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
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-Topic 210
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- Definition

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

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Note 6 - Shareholders' Equity (Details Textual) - USD ($)		3 Months Ended
	Aug. 13, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)		35,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)		$ 1.21
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)		35,000	60,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)		$ 1.21	$ 1.93