Quarterly report pursuant to Section 13 or 15(d)

A. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details-Product warranties)

v3.8.0.1
A. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details-Product warranties) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Product warranties    
Beginning balance $ 59,892 $ 95,540
Warranty claims incurred (6,023) (84,087)
Provision charged to expense 1,447 48,439
Ending balance $ 55,316 $ 59,892