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v3.19.1

Segment Information - Financial Data by Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Net sales | $ 31,130,000 | $ 34,731,000 | $ 39,751,000 | $ 31,709,000 | $ 30,171,000 | $ 33,785,000 | $ 38,849,000 | $ 27,745,000 | $ 137,321,395 | $ 130,550,349
Operating income |  |  |  |  |  |  |  |  | 7,456,906 | 7,883,053
Assets | 109,477,786 |  |  |  | 114,729,806 |  |  |  | 109,477,786 | 114,729,806
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 2,851,000 | 7,146,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,229,000 | 2,895,000
United States |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 120,993,000 | 115,407,000
Operating income |  |  |  |  |  |  |  |  | 6,103,000 | 6,788,000
Assets | 99,720,000 |  |  |  | 104,431,000 |  |  |  | 99,720,000 | 104,431,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 2,705,000 | 7,014,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,153,000 | 2,845,000
Canada |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,040,000 | 6,935,000
Operating income |  |  |  |  |  |  |  |  | 884,000 | 775,000
Assets | 3,839,000 |  |  |  | 4,926,000 |  |  |  | 3,839,000 | 4,926,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 83,000 | 19,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,000 | 8,000
Europe |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,288,000 | 8,208,000
Operating income |  |  |  |  |  |  |  |  | 470,000 | 320,000
Assets | $ 5,918,000 |  |  |  | $ 5,373,000 |  |  |  | 5,918,000 | 5,373,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 63,000 | 113,000
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 67,000 | $ 42,000

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