Annual report pursuant to Section 13 and 15(d)

A. SUMMARY OF ACCOUNTING POLICIES (Tables)

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A. SUMMARY OF ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of allowance for doubtful accounts

The allowance for doubtful accounts for the years ended December 31 are as follows:

  

    2017   2016
Beginning balance   $ 34,573   $          13,299
Provision charged to expense     35,187              32,047
Deductions     (47,587            (10,773)
Ending balance   $ 22,173   $          34,573
Schedule of product warranties

Product warranties for the years ended December 31 is as follows:

  

    2017     2016  
Beginning balance   $ 95,540     $ 66,555  
Warranty claims incurred     (84,087 )     (115,120 )
Provision charged to expense     48,439       144,105  
Ending balance   $ 59,892     $ 95,540