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Note 9 - Subsequent Events (Details Textual)				3 Months Ended	12 Months Ended
	Apr. 27, 2020 USD ($) shares	Apr. 24, 2020 $ / shares shares	Apr. 01, 2020 shares	Mar. 31, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares	May 04, 2020
Stock Issued During Period, Shares, Issued for Services (in shares)				5,000	506,707
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)				1,165,325	1,744,300
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | $ / shares					$ 0.46
Subsequent Event [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)			5,000
Subsequent Event [Member] | License Agreement [Member] | MD Anderson [Member]
Number of Allowed Patents						16
Subsequent Event [Member] | Dr. Julian Pham [Member]
Months of Pay Eligible to be Received (Month)	150 days
Base Salary | $	$ 375,000
Aggregate Amount of Base Salary Eligible to be Received | $	$ 156,250
Months of Insurance Coverage Eligible for Reimbursement (Month)	150 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	410,117
Subsequent Event [Member] | Warrants Issued for Services [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		500,000
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | $ / shares		$ 2.27
Subsequent Event [Member] | New Employee [member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)		50,000

X

- Definition

Represents the aggregate amount of base salary eligible to be received by an employee or former employee.

+ References

No definition available.

+ Details

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X

- Definition

The base annual salary of an employee.

+ References

No definition available.

+ Details

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X

- Definition

Exercise price per share of warrants or rights issued during period.

+ References

No definition available.

+ Details

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X

- Definition

The number of months of insurance coverage that are eligible for reimbursement to an employee or former employee.

+ References

No definition available.

+ Details

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X

- Definition

The number of months of pay an employee, or former employee is eligible to receive.

+ References

No definition available.

+ Details

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X

- Definition

The number of pending patents.

+ References

No definition available.

+ Details

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X

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

+ References

No definition available.

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