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Inventory (Tables) | 3 Months Ended
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Mar. 31, 2019
Inventory Disclosure [Abstract] |
Schedule of Inventory, Current [Table Text Block] |
| March 31, 2019 |  | December 31, 2018
Raw materials | $ | 16,646,000 |  |  | $ | 17,278,000 |
Work in process | 1,993,000 |  |  | 2,034,000 |
Finished goods | 7,476,000 |  |  | 6,453,000 |
| $ | 26,115,000 |  |  | $ | 25,765,000 |

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