Note 2 - Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Cash, Uninsured Amount	$ 1,659,000
Advertising Expense	46,129	$ 32,124
Shipping, Handling and Transportation Costs	6,092	11,831
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 0	$ 0
Earnings Per Share, Basic and Diluted	$ 0.02	$ 0.02
Restricted Cash and Cash Equivalents, Current	$ 0	$ 233,050
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

The terms of a warranty.

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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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 35
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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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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.

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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

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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.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs.

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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.

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