Note I - Stockholders' Equity - Assumptions Used to Value Liability Classified Warrants Exercised (Details) - The 2019 Warrants [Member]	12 Months Ended
Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 $ / shares yr shares
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
Warrants Liabilities Exercised [Member]
Weighted average fair value of securities granted, warrants (in dollars per share)		$ 0.98
Number of shares underlying securities granted, warrants (in shares) \| shares		665,000
Measurement Input, Share Price [Member]
Warrants, measurement input	0.33	1.28
Measurement Input, Expected Term [Member]
Warrants, measurement input	4.9	4.1
Measurement Input, Price Volatility [Member]
Warrants, measurement input	83	88
Measurement Input, Expected Dividend Rate [Member]
Warrants, measurement input	0	0
Measurement Input, Expected Dividend Rate [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input		0
Measurement Input, Exercise Price [Member]
Warrants, measurement input	0.5	0.5
Measurement Input, Exercise Price [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input		0.5
Measurement Input, Risk Free Interest Rate [Member]
Warrants, measurement input	2.3	1.71
Minimum [Member] \| Measurement Input, Share Price [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input		0.83
Minimum [Member] \| Measurement Input, Expected Term [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input \| yr		4.2
Minimum [Member] \| Measurement Input, Price Volatility [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input		0.86
Minimum [Member] \| Measurement Input, Risk Free Interest Rate [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input		0.0138
Maximum [Member] \| Measurement Input, Share Price [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input		1.42
Maximum [Member] \| Measurement Input, Expected Term [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input \| yr		4.3
Maximum [Member] \| Measurement Input, Price Volatility [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input		0.87
Maximum [Member] \| Measurement Input, Risk Free Interest Rate [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input		0.0173

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

+ Details

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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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