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, 2016
Accounting Policies [Abstract]  
Schedule of allowance for doubtful accounts
    2016     2015  
Beginning balance   $ 13,299     $ 25,973  
Provision charged to expense     32,047       6,618  
Deductions     (10,773 )     (19,292 )
Ending balance   $ 34,573     $ 13,299  
Product warranties
    2016     2015  
Beginning balance   $ 28,702     $ 23,500  
Warranty claims incurred     (50,353 )     (16,434 )
Provision charged to expense     70,800       21,636  
Ending balance   $ 49,149     $ 28,702