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Product Warranties
12 Months Ended
Dec. 31, 2018
Product Warranties Disclosures [Abstract]  
Product Warranty Disclosure [Text Block]
Note 6 – Product Warranties
 
A summary of the Company’s warranty liability activity, which is included in accrued liabilities in the accompanying balance sheets as of December 31, 2018 and 2017, is as follows:
 
 
 
2018
 
 
2017
 
Warranty liability, beginning of year
 
$
181,000
 
 
$
213,000
 
Accruals
 
 
51,000
 
 
 
69,000
 
Payments
 
 
(32,000
)
 
 
(114,000
)
Adjustments and other
 
 
57,000
 
 
 
13,000
 
Warranty liability, end of year
 
$
257,000
 
 
$
181,000