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Segment Information - Financial Data by Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Net sales | $ 23,118,000 | $ 29,903,000 | $ 33,954,000 | $ 22,837,000 | $ 24,666,000 | $ 30,008,000 | $ 33,396,000 | $ 19,152,000 | $ 109,811,768 | $ 107,222,306
Operating income |  |  |  |  |  |  |  |  | 7,347,006 | 7,394,461
Assets | 81,421,366 |  |  |  | 79,308,086 |  |  |  | 81,421,366 | 79,308,086
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 1,757,000 | 2,042,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,053,000 | 1,700,000
United States |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 96,622,000 | 91,298,000
Operating income |  |  |  |  |  |  |  |  | 7,147,000 | 6,760,000
Assets | 73,688,000 |  |  |  | 70,525,000 |  |  |  | 73,688,000 | 70,525,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 1,720,000 | 2,011,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,017,000 | 1,618,000
Canada |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,804,000 | 8,841,000
Operating income |  |  |  |  |  |  |  |  | 56,000 | 625,000
Assets | 3,709,000 |  |  |  | 4,363,000 |  |  |  | 3,709,000 | 4,363,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 19,000 | 12,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,000 | 7,000
Europe |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,385,000 | 7,083,000
Operating income |  |  |  |  |  |  |  |  | 144,000 | 9,000
Assets | $ 4,024,000 |  |  |  | $ 4,419,000 |  |  |  | 4,024,000 | 4,419,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 17,000 | 19,000
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 28,000 | $ 75,000

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