Note 9 - Capital Transactions (Details Textual) - USD ($)						3 Months Ended	11 Months Ended	12 Months Ended
	Mar. 01, 2022	Jan. 02, 2021	Dec. 15, 2020	Dec. 07, 2020	Nov. 16, 2020	Mar. 31, 2021	Mar. 03, 2022	Mar. 31, 2022	Mar. 31, 2021	Jul. 18, 2021	Feb. 08, 2021	Jan. 01, 2021	Mar. 31, 2020	Feb. 28, 2019
Proceeds from Warrant Exercises								$ 138,728	$ 1,075,396
Class of Warrant or Right, Issued During Period (in shares)								2,095,333	43,493,809
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share)								$ 0.10	$ 0.10
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total								$ 17,333
Class of Warrant or Right, Outstanding (in shares)						85,843,036		75,124,673	85,843,036				84,538,161
Class of Warrant or Right, Expense								$ 60,667	$ 211,000
Common Stock [Member]
Exercise of Warrants for Stock, Shares (in shares)								2,095,333	35,798,809
Convertible Debt [Member]
Debt Instrument, Extended Amount						$ 197,000			$ 197,000
Convertible Notes Payable [Member] | March And July 2017 Convertible Note Offering [Member]
Debt Instrument, Extension Period (Year)									3 years
Debt Instrument, Extended Amount								$ 197,000
Debt Instrument, Convertible, Conversion Price (in dollars per share)								$ 0.10
Senior Secured Convertible Promissory Note [Member] | The 8% Senior Secured Convertible Promissory Note Dated February 28, 2019 [Member]
Debt Conversion, Original Debt, Amount						$ 160,000
Senior Secured Convertible Promissory Note [Member] | The 8% Senior Secured Convertible Promissory Note Dated February 28, 2019 [Member] | Common Stock [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)						$ 0.04			$ 0.04					$ 0.17
Debt Conversion, Converted Instrument, Shares Issued (in shares)						4,000,000
Scientist and Researcher [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)									3,500,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)									$ 0.05
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value									$ 168,000
Former Director [Member]
Share-based Payment Arrangement, Expense					$ 6,300
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.03
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)					450,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period Before Modification, Fair Value					$ 4,950
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period After Modification, Fair Value					$ 11,250
Employees and Directors [Member]
Share-based Payment Arrangement, Expense									62,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			3,250,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)			$ 0.05
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value									156,000
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount						$ 78,000			78,000
Current Employees [Member]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)			$ 0.05
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)			6,050,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period Before Modification, Fair Value			$ 199,600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period After Modification, Fair Value			250,650
Share-Based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense			$ 51,050				$ 60,667	$ 60,667	$ 436,349
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total								17,333
Share-Based Payment Arrangement, Option [Member] | Scientist and Researcher [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)									10 years
Share-Based Payment Arrangement, Option [Member] | Employees and Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)			10 years
Share-Based Payment Arrangement, Option [Member] | Employees and Directors [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage			33.30%
Share-Based Payment Arrangement, Option [Member] | Employees and Directors [Member] | Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage			33.30%
Share-Based Payment Arrangement, Option [Member] | Employees and Directors [Member] | Share-Based Payment Arrangement, Tranche Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage			33.30%
Share-Based Payment Arrangement, Nonemployee [Member]
Share-based Payment Arrangement, Expense								$ 28,800
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								600,000	3,500,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)								$ 0.05	$ 0.05
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						5,883,000		6,483,000	5,883,000				2,383,000
Minimum [Member]
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share)									$ 0.030
Maximum [Member]
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share)									$ 0.035
Warrants Issued to Investors in Private Placements [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)										$ 0.10
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)										1
Warrants and Rights Outstanding, Term (Year)										3 years
Class of Warrant or Right, Exercises in Period (in shares)	7,601,813							2,095,333	35,798,809
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share)	$ 0.01							$ 0.03
Proceeds from Warrant Exercises	$ 76,068							$ 56,394	$ 968,023
Brokerage Fees for Issuance of Common Stock and Warrants								6,266	107,373
Induced Dividend from Warrant Exercises								163,017	$ 1,591,080
Class of Warrant or Right, Exercised During Period, Intrinsic Value								62,660
Class of Warrant or Right, Issued During Period, Fair Value								$ 100,357
Exercise of Warrants for Stock, Shares (in shares)								2,088,667
Warrants Issued to Investors in Private Placements [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)													$ 0.03
Warrants Issued to Investors in Private Placements [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)													$ 0.05
Warrants Issued to Researcher as Compensation [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)								1
Warrants and Rights Outstanding, Term (Year)								10 years
Class of Warrant or Right, Issued During Period (in shares)								600,000
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share)								$ 0.05
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share)								$ 0.048
Convertible Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 0.10			$ 0.10
Class of Warrant or Right, Issued During Period (in shares)									788,000
Class of Warrant or Right, Extension Period of Securities Called by Warrants or Rights (Year)									3 years
Warrants and Rights Outstanding						$ 13,396			$ 13,396
Employees and Director Warrants [Member] | Employees and Directors [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 0.04
Warrants and Rights Outstanding, Term (Year)				10 years
Share-based Payment Arrangement, Expense				$ 133,000
Warrants and Rights Outstanding				$ 133,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				3,500,000
Compensation Warrants Issued to Brokers [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.01
Warrants and Rights Outstanding		$ 367,196										$ 135,861
Class of Warrant or Right, Outstanding (in shares)		9,424,613
Class of Warrant or Right, Expense		$ 231,335
Compensation Warrants Issued to Brokers [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)												$ 0.25
Compensation Warrants Issued to Brokers [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)												$ 1.00
Replacement Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)											$ 0.10
Warrants and Rights Outstanding, Term (Year)											3 years
Warrants and Rights Outstanding											$ 1,182,920
Class of Warrant or Right, Outstanding (in shares)											42,705,809