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Product Warranties (Tables) | 12 Months Ended
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Dec. 31, 2018
Product Warranties Disclosures [Abstract] |
Schedule of Product Warranty Liability [Table Text Block] | 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 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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