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Segment Information - Financial Data by Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Net sales | $ 30,171,000 | $ 33,785,000 | $ 38,849,000 | $ 27,745,000 | $ 26,377,000 | $ 31,913,000 | $ 40,997,000 | $ 25,288,000 | $ 130,550,349 | $ 124,574,371
Operating income |  |  |  |  |  |  |  |  | 7,796,053 | 8,442,056
Assets | 114,729,806 |  |  |  | 92,066,092 |  |  |  | 114,729,806 | 92,066,092
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 7,146,000 | 1,789,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,895,000 | 2,393,000
United States |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 115,407,000 | 110,793,000
Operating income |  |  |  |  |  |  |  |  | 6,701,000 | 7,769,000
Assets | 104,431,000 |  |  |  | 84,104,000 |  |  |  | 104,431,000 | 84,104,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 7,014,000 | 1,737,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,845,000 | 2,362,000
Canada |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,935,000 | 6,824,000
Operating income |  |  |  |  |  |  |  |  | 775,000 | 568,000
Assets | 4,926,000 |  |  |  | 3,882,000 |  |  |  | 4,926,000 | 3,882,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 19,000 | 7,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,000 | 8,000
Europe |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,208,000 | 6,957,000
Operating income |  |  |  |  |  |  |  |  | 320,000 | 105,000
Assets | $ 5,373,000 |  |  |  | $ 4,080,000 |  |  |  | 5,373,000 | 4,080,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 113,000 | 44,000
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 42,000 | $ 23,000

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