Note 2 - Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic and Diluted	$ 0	$ 0	$ 0	$ 0.01
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			3,000,000	3,000,000
Maximum [Member]
Product Warranty Expense	$ 2,000	$ 2,000	$ 2,000	$ 2,000
Electronic Products [Member]
Warranty Term			90 days
Electronic Controllers for Spas and Hot Tubs [Member]
Warranty Term			5 years

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.

No definition available.

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Balance Type:	na
Period Type:	duration