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Patents and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | Patents and other intangible assets are summarized as follows:
|  | December 31, |
|  | 2018 |  |  | 2017 |
Patents |  |  |  |  |  |  |  |
Patents pending |  | $ | 1,202,000 |  |  | $ | 1,167,000 |
Issued patents |  |  | 761,000 |  |  |  | 930,000 |
|  |  | 1,963,000 |  |  |  | 2,097,000 |
Trademarks |  |  |  |  |  |  |  |
Trademarks pending |  |  | 55,000 |  |  |  | 41,000 |
Registered trademarks |  |  | 23,000 |  |  |  | 23,000 |
|  |  | 78,000 |  |  |  | 64,000 |
Other |  |  | 8,000 |  |  |  | 8,000 |
|  |  | 2,049,000 |  |  |  | 2,169,000 |
Accumulated amortization |  |  | (290,000 | ) |  |  | (313,000 | )
|  | $ | 1,759,000 |  |  | $ | 1,856,000 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | Future amortization expense associated with awarded patents and registered trademarks as of December 31, 2018 is estimated as follows:
2019 |  | $ | 169,000 |
2020 |  |  | 142,000 |
2021 |  |  | 88,000 |
2022 |  |  | 62,000 |
2023 |  |  | 32,000 |
Thereafter |  |  | 7,000 |
|  | $ | 500,000 |

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