Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
|
|
12 Months Ended |
Sep. 07, 2021 |
Mar. 31, 2022 |
Mar. 31, 2021 |
| Cash, Uninsured Amount |
|
$ 887,000
|
|
| Accounts Receivable, Allowance for Credit Loss, Ending Balance |
|
925,000
|
$ 300,000
|
| Contract with Customer, Liability, Revenue Recognized |
|
|
179,000
|
| Advertising Expense |
|
27,546
|
34,473
|
| Shipping and Handling Costs |
|
9,371
|
4,264
|
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total |
|
$ 0
|
$ 0
|
| Earnings Per Share, Basic, Total (in dollars per share) |
|
$ (0.02)
|
$ (0.01)
|
| Gain (Loss) on Extinguishment of Debt, Total |
|
$ 693,817
|
$ 0
|
| Paycheck Protection Program CARES Act [Member] |
|
|
|
| Gain (Loss) on Extinguishment of Debt, Total |
$ 361,275
|
693,817
|
|
| Maximum [Member] |
|
|
|
| Product Warranty Expense |
|
$ 2,000
|
$ 2,000
|
| Property, Plant and Equipment, Useful Life (Year) |
|
7 years
|
|
| Minimum [Member] |
|
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
5 years
|
|
| Electronic Products [Member] |
|
|
|
| Warranty Term (Day) |
|
90 days
|
|
| Electronic Controllers for Spas and Hot Tubs [Member] |
|
|
|
| Warranty Term (Day) |
|
5 years
|
|