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Non-voting common stock conversion to voting common stock ratio

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Share based compensation arrangement by share based payment award percentage applied on outstanding shares of common stock for automatically increase on each year.

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The percentage of RDO price per share as the exercise price of the warrants issued.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Exercise price per share or per unit of warrants or rights outstanding.

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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.

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Aggregate number of common shares reserved for future issuance.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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The cash inflow from the additional capital contribution to the entity.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Note 5 - Equity (Details Textual)									12 Months Ended
Note 5 - Equity (Details Textual)	Jan. 25, 2020 shares	Jan. 01, 2020 shares	Nov. 22, 2019 USD ($) $ / shares shares	Jan. 01, 2019 shares	Sep. 20, 2018 shares	Aug. 01, 2018 $ / shares shares	May 09, 2018 USD ($) $ / shares shares	Apr. 03, 2018 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Mar. 31, 2018 $ / shares shares	Jan. 29, 2018 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares shares
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares									$ 1.45	$ 2.36			$ 5.17
Proceeds from Issuance of Common Stock \| $									$ 1,267,194	$ 15,389,518
Stock Issued During Period, Shares, Issued for Services									506,707	200,009
Stock Issued During Period, Value, Issued for Services \| $									$ 469,588	$ 553,303
Preferred Stock, Shares Authorized								10,000,000			10,000,000
Preferred Stock, Par or Stated Value Per Share \| $ / shares									$ 0.001		$ 0.001
Preferred Stock, Shares Outstanding, Ending Balance									0
Non-voting To Voting Common Stock, Conversion Ratio								1
Common Stock, Shares Authorized								200,000,000	200,000,000	200,000,000	200,000,000
Common Stock, Par or Stated Value Per Share \| $ / shares								$ 0.001	$ 0.001	$ 0.001	$ 0.001
Common Stock, Shares, Outstanding, Ending Balance									19,263,841	15,239,148
Class of Warrant or Right, Issued in Period									3,611,504	3,166,492
Class of Warrant or Right, Issued During Period, Exercise Price \| $ / shares									$ 0.47	$ 1.74
Class of Warrant or Right, Exercised During Period										34,615
Class of Warrant or Right, Cancelled During Period										15,385
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance									5,982,923	4,535,681			2,628,749
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period									10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance \| $ / shares									$ 2.66	$ 3.31			$ 1.31
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross									1,744,300	2,034,525
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares									$ 1.48	$ 6.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total									297,058	127,593
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term									7 years 164 days	7 years 270 days
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount \| $									$ 4.50
Share-based Payment Arrangement, Expense \| $									3,500,000
Graded Vesting Method [Member]
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount \| $									4,300,000
Cliff Vesting Method [Member]
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount \| $									$ 200,000
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition									2 years
Share-based Payment Arrangement, Expense \| $									$ 3,000,000
Performance Shares [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition									1 year 127 days
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $									$ 1.30
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	40,000
The 2018 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant								4,160,000
Share Based Compensation Arrangement By Share Based Payment Award, Percentage Applied on Outstanding Shares of Common Stock For Automatically Increase on Each Year								5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized				761,957
The 2018 Equity Incentive Plan [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		963,192
The 2009 Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance								554,963
The 2018 Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award, Percentage Applied on Outstanding Shares of Common Stock For Automatically Increase on Each Year								2.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized								208,500
Conversion of Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted										1,394,953
Conversion of Stock, Shares Issued								1,235,219		9,324,177
World Wide Holdings, LLC [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					50,000
Class of Warrant or Right, Exercised During Period					34,615
Class of Warrant or Right, Cancelled During Period					15,385
Warrants Issued with Registered Direct Offering [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			3,167,986
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares			$ 0.46
Warrants Issued to Underwriter [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			443,518						3,167,986
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares			$ 0.58						$ 0.46
Warrants, Exercise Price, Percentage of RDO Price Per Share \| $ / shares			$ 125
Class of Warrant or Right, Issued in Period										38,400
Class of Warrant or Right, Issued During Period, Exercise Price \| $ / shares										$ 6.25
Warrants Issued to Investors to Purchase Common Stock [Member]
Class of Warrant or Right, Issued in Period										2,283,740
Class of Warrant or Right, Issued During Period, Exercise Price \| $ / shares										$ 4.25
Warrants Issued for Services [Member]
Class of Warrant or Right, Issued in Period										844,352
Warrants and Rights Outstanding \| $										$ 2,203,506
Warrants Issued for Services [Member] \| Cancer Revolution, LLC [Member]
Class of Warrant or Right, Issued in Period										425,000
Warrants Issued for Services [Member] \| Cancer Biotech, LLC [Member]
Class of Warrant or Right, Issued in Period										225,000
Warrants Issued for Services [Member] \| Inception Capital Management, LLC [Member]
Class of Warrant or Right, Issued in Period										144,352
Warrants Issued for Services [Member] \| World Wide Holdings, LLC [Member]
Class of Warrant or Right, Issued in Period										50,000
Class of Warrant or Right, Issued During Period, Exercise Price \| $ / shares										$ 5
Warrants Issued for Services [Member] \| FundAthena, Inc [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights												6,000
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares												$ 5
Class of Warrant or Right, Issued in Period										0
Accounts Payable, Total \| $												$ 30,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period									4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance \| $ / shares									$ 9.80	$ 9.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value \| $ / shares									7.93
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares									$ 1.62
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period									1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance \| $ / shares									$ 0.001	$ 2.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value \| $ / shares									0.001
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares									$ 0.30
Weighted Average [Member] \| Share-based Payment Arrangement, Option [Member] \| Graded Vesting Method [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition									1 year 313 days
Weighted Average [Member] \| Share-based Payment Arrangement, Option [Member] \| Cliff Vesting Method [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition									171 days
IPO [Member]
Stock Issued During Period, Shares, New Issues								1,280,000
Sale of Stock, Price Per Share \| $ / shares								$ 5
Proceeds from Issuance Initial Public Offering \| $								$ 5,025,000
Payments of Stock Issuance Costs \| $								$ 895,000
Percentage of Common Stock Issuance of Warrant or Right Issued								3.00%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								38,400
Private Placement [Member]
Stock Issued During Period, Shares, New Issues							828,500		350,000
Sale of Stock, Price Per Share \| $ / shares							$ 12.07
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares							$ 15.62
Proceeds from Issuance of Common Stock \| $							$ 9,250,000
Private Placement [Member] \| Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues						1,174,440
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						2,283,740			2,283,740
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares						$ 4.25			$ 0.46
Private Placement [Member] \| Maximum [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right							621,376
Private Placement [Member] \| Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares							$ 4.25
Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues			3,167,986						3,167,986
Proceeds from Issuance of Common Stock \| $			$ 1,093,000						$ 1,267,194
Shares Issued, Price Per Share \| $ / shares			$ 0.40
Registered Direct Offering [Member] \| Underwriter [Member]
Stock Issued During Period, Shares, New Issues									443,518
Percentage of Common Stock Issuance of Warrant or Right Issued			7.00%
Shares Issued, Price Per Share \| $ / shares									$ 0.58
IPO and Private Placement [Member]
Stock Issued During Period, Shares, New Issues										3,282,940
Proceeds from Issuance of Common Stock \| $										$ 16,400,000