Note 2 - Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended	17 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Sep. 01, 2018
Cash, Uninsured Amount	$ 1,388,775
Accounts Receivable, Allowance for Credit Loss, Ending Balance	160,000	$ 125,000
Advertising Expense	59,877	62,297
Shipping and Handling Costs	3,754	2,904
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 0	$ 0
Earnings Per Share, Basic and Diluted, Total	$ (0.01)	$ 0	$ 0
Maximum [Member]
Product Warranty Expense	$ 2,000	$ 2,000
Property, Plant and Equipment, Useful Life	7 years
Minimum [Member]
Property, Plant and Equipment, Useful Life	5 years
Electronic Products [Member]
Warranty Term	90 days
Electronic Controllers for Spas and Hot Tubs [Member]
Warranty Term	5 years

Represents the amount of shipping and handling costs incurred during the period.

No definition available.

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- Definition

The terms of a warranty.

+ References

No definition available.

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

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- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

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-Publisher FASB
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-SubTopic 20
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- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256

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- Definition

The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

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