A. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details-Product warranties) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
|
| Product warranties | ||
| Beginning balance | $ 45,328 | $ 58,791 |
| Warranty claims incurred | (2,738) | (20,499) |
| Provision charged (credited) to expense | (18,833) | 7,036 |
| Ending balance | $ 23,757 | $ 45,328 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of increase in the standard and extended product warranty accrual from warranties issued. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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