NOTE 5. STOCK-BASED COMPENSATION (Details)	12 Months Ended
Mar. 31, 2023 USD ($) shares	Mar. 31, 2022 USD ($) shares
Details
Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture	$ 59,657	$ 81,855
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Method Used	Black-Scholes-Merton option-pricing model
Remaining weighted-average exercisable life (years)	5.9	5.0
Outstanding Options Exercisable \| shares	32,000	24,000
Total fair value of option grants	$ 58,900
Unrecognized stock-based compensation	$ 2,173

Represents the Outstanding Options Exercisable (number of shares), as of the indicated date.

No definition available.

Name:	fil_OutstandingOptionsExercisable
Namespace Prefix:	fil_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the Remaining weighted-average exercisable life (years), as of the indicated date.

+ References

No definition available.

+ Details

Name:	fil_RemainingWeightedAverageExercisableLifeYears
Namespace Prefix:	fil_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the monetary amount of Total fair value of option grants, during the indicated time period.

+ References

No definition available.

+ Details

Name:	fil_TotalFairValueOfOptionGrants1
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the monetary amount of Unrecognized stock-based compensation, during the indicated time period.

+ References

No definition available.

+ Details

Name:	fil_UnrecognizedStockBasedCompensation
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Description of method used to estimate fair value of award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Value, after forfeiture, of shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 30
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480513/718-10-30-3

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 30
-Section 35
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480843/718-30-35-1

+ Details

Name:	us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_TextBlockAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration