Annual report pursuant to Section 13 and 15(d)

A. SUMMARY OF ACCOUNTING POLICIES (Tables)

v3.19.1
A. SUMMARY OF ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of allowance for doubtful accounts
    2018     2017  
Beginning balance   $ 22,173     $ 34,573  
Provision charged to expense     55,152       35,187  
Deductions     (11,783 )     (47,587 )
Ending balance   $ 65,542     $ 22,173  
Schedule of product warranties
    2018     2017  
Beginning balance   $ 59,892     $ 95,540  
Warranty claims incurred     (28,000 )     (84,087 )
Provision charged to expense     14,211       48,439  
Ending balance   $ 46,103     $ 59,892