Note I - Stockholders' Equity - Assumptions Used to Value Liability Classified Warrants Exercised (Details) - The 2019 Warrants [Member]	12 Months Ended
Dec. 31, 2019 $ / shares shares	Nov. 30, 2019 shares
Number of shares underlying warrants exercised (in shares)	1,084,171	1,749,171
Warrants Liabilities Exercised [Member]
Weighted average fair value of warrants exercised (in dollars per share) \| $ / shares	$ 0.98
Number of shares underlying warrants exercised (in shares)	665,000
Measurement Input, Share Price [Member]
Warrants, measurement input		0.33
Measurement Input, Share Price [Member] \| Warrants Liabilities Exercised [Member] \| Minimum [Member]
Warrants, measurement input	0.83
Measurement Input, Share Price [Member] \| Warrants Liabilities Exercised [Member] \| Maximum [Member]
Warrants, measurement input	1.42
Measurement Input, Expected Term [Member]
Warrants, measurement input		4.9
Measurement Input, Expected Term [Member] \| Warrants Liabilities Exercised [Member] \| Minimum [Member]
Warrants, measurement input	4.2
Measurement Input, Expected Term [Member] \| Warrants Liabilities Exercised [Member] \| Maximum [Member]
Warrants, measurement input	4.3
Measurement Input, Price Volatility [Member]
Warrants, measurement input		0.83
Measurement Input, Price Volatility [Member] \| Warrants Liabilities Exercised [Member] \| Minimum [Member]
Warrants, measurement input	0.86
Measurement Input, Price Volatility [Member] \| Warrants Liabilities Exercised [Member] \| Maximum [Member]
Warrants, measurement input	87
Measurement Input, Expected Dividend Rate [Member]
Warrants, measurement input		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
Measurement Input, Exercise Price [Member] \| Warrants Liabilities Exercised [Member]
Warrants, measurement input	0.5
Measurement Input, Risk Free Interest Rate [Member]
Warrants, measurement input		0.023
Measurement Input, Risk Free Interest Rate [Member] \| Warrants Liabilities Exercised [Member] \| Minimum [Member]
Warrants, measurement input	1.38
Measurement Input, Risk Free Interest Rate [Member] \| Warrants Liabilities Exercised [Member] \| Maximum [Member]
Warrants, measurement input	1.73

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

No definition available.

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Period Type:	duration

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ 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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