Note I - Stockholders' Equity - Assumptions Used to Value Warrants at Grant Date (Details)	12 Months Ended
Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares
Fair Value of Common Stock, employee stock options (in dollars per share)		$ 0.84
Share-based Payment Arrangement, Option [Member]
Fair Value of Common Stock, employee stock options (in dollars per share)		$ 1.28
Volatility, employee stock options, minimum	91.80%	92.00%
Volatility, employee stock options, maximum	102.30%	102.00%
Dividend yield, employee stock options	0.00%	0.00%
Risk-free interest rate, employee stock options, minimum	1.68%	1.53%
Risk-free interest rate, employee stock options, maximum	1.53%	1.63%
Weighted average fair value of options granted, employee stock options (in dollars per share)	$ 0.72	$ 0.64
Number of options granted (in shares) \| shares	592,358	592,358
Minimum [Member] \| Share-based Payment Arrangement, Option [Member]
Fair Value of Common Stock, employee stock options (in dollars per share)	$ 1.07
Expected Term, employee stock options (Year)	1 year 36 days	1 year
Exercise Price, employee stock options (in dollars per share)	$ 1.04	$ 1.04
Maximum [Member] \| Share-based Payment Arrangement, Option [Member]
Fair Value of Common Stock, employee stock options (in dollars per share)	$ 1.60
Expected Term, employee stock options (Year)	2 years 80 days	2 years 36 days
Exercise Price, employee stock options (in dollars per share)	$ 2.09	$ 2.09
The 2016 Warrants [Member]
Weighted average fair value of securities granted, warrants (in dollars per share)
Number of shares underlying securities granted, warrants (in shares) \| shares	1,592,775	1,592,775
The 2016 Warrants [Member] \| Measurement Input, Share Price [Member]
Warrants, measurement input		1.28
The 2016 Warrants [Member] \| Measurement Input, Expected Term [Member]
Warrants, measurement input		0.1
The 2016 Warrants [Member] \| Measurement Input, Price Volatility [Member]
Warrants, measurement input		38
The 2016 Warrants [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants, measurement input	0	0
The 2016 Warrants [Member] \| Measurement Input, Exercise Price [Member]
Warrants, measurement input	2.55	2.55
The 2016 Warrants [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants, measurement input		1.56
The 2016 Warrants [Member] \| Minimum [Member] \| Measurement Input, Share Price [Member]
Warrants, measurement input	0.36
The 2016 Warrants [Member] \| Minimum [Member] \| Measurement Input, Expected Term [Member]
Warrants, measurement input	0.2
The 2016 Warrants [Member] \| Minimum [Member] \| Measurement Input, Price Volatility [Member]
Warrants, measurement input	86
The 2016 Warrants [Member] \| Minimum [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants, measurement input	1.88
The 2016 Warrants [Member] \| Maximum [Member] \| Measurement Input, Share Price [Member]
Warrants, measurement input	0.83
The 2016 Warrants [Member] \| Maximum [Member] \| Measurement Input, Expected Term [Member]
Warrants, measurement input	0.5
The 2016 Warrants [Member] \| Maximum [Member] \| Measurement Input, Price Volatility [Member]
Warrants, measurement input	100
The 2016 Warrants [Member] \| Maximum [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants, measurement input	2.09
The 2019 Warrants [Member]
Weighted average fair value of securities granted, warrants (in dollars per share)	$ 0.22	$ 1.01
Number of shares underlying securities granted, warrants (in shares) \| shares	1,749,171	1,084,171
The 2019 Warrants [Member] \| Measurement Input, Share Price [Member]
Warrants, measurement input	0.33	1.28
The 2019 Warrants [Member] \| Measurement Input, Expected Term [Member]
Warrants, measurement input	4.9	4.1
The 2019 Warrants [Member] \| Measurement Input, Price Volatility [Member]
Warrants, measurement input	83	88
The 2019 Warrants [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants, measurement input	0	0
The 2019 Warrants [Member] \| Measurement Input, Exercise Price [Member]
Warrants, measurement input	0.5	0.5
The 2019 Warrants [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants, measurement input	2.3	1.71

The weighted average grant-date fair value of warrants granted during the reporting period.

No definition available.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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- Definition

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

+ References

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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