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Segment Information - Financial Data by Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Net sales | $ 26,377,000 | $ 31,913,000 | $ 40,997,000 | $ 25,288,000 | $ 23,118,000 | $ 29,903,000 | $ 33,954,000 | $ 22,837,000 | $ 124,574,371 | $ 109,811,768
Operating income |  |  |  |  |  |  |  |  | 8,442,056 | 7,347,006
Assets | 92,066,092 |  |  |  | 81,421,366 |  |  |  | 92,066,092 | 81,421,366
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 1,789,000 | 1,757,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,393,000 | 2,053,000
United States |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 110,793,000 | 96,622,000
Operating income |  |  |  |  |  |  |  |  | 7,769,000 | 7,147,000
Assets | 84,104,000 |  |  |  | 73,688,000 |  |  |  | 84,104,000 | 73,688,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 1,737,000 | 1,720,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,362,000 | 2,017,000
Canada |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,824,000 | 6,804,000
Operating income |  |  |  |  |  |  |  |  | 568,000 | 56,000
Assets | 3,882,000 |  |  |  | 3,709,000 |  |  |  | 3,882,000 | 3,709,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 7,000 | 19,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,000 | 8,000
Europe |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,957,000 | 6,385,000
Operating income |  |  |  |  |  |  |  |  | 105,000 | 144,000
Assets | $ 4,080,000 |  |  |  | $ 4,024,000 |  |  |  | 4,080,000 | 4,024,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 44,000 | 17,000
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 23,000 | $ 28,000

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