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Segment Information - Financial Data by Segment (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Sales to unaffiliated customers | $ 19,535,000 | $ 20,363,000 | $ 27,594,000 | $ 16,878,000 | $ 15,836,000 | $ 19,036,000 | $ 24,029,000 | $ 14,401,000 | $ 84,369,770 | $ 73,301,864
Operating income |  |  |  |  |  |  |  |  | 5,360,520 | 4,284,964
Assets | 67,827,816 |  |  |  | 55,221,736 |  |  |  | 67,827,816 | 55,221,736
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 681,000 | 941,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,089,000 | 978,000
United States |  |  |  |  |  |  |  |  |  |
Sales to unaffiliated customers |  |  |  |  |  |  |  |  | 67,510,000 | 56,663,000
Operating income |  |  |  |  |  |  |  |  | 4,394,000 | 3,485,000
Assets | 56,115,000 |  |  |  | 43,174,000 |  |  |  | 56,115,000 | 43,174,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 656,000 | 912,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 980,000 | 857,000
Canada |  |  |  |  |  |  |  |  |  |
Sales to unaffiliated customers |  |  |  |  |  |  |  |  | 8,808,000 | 8,514,000
Operating income |  |  |  |  |  |  |  |  | 775,000 | 924,000
Assets | 6,107,000 |  |  |  | 6,033,000 |  |  |  | 6,107,000 | 6,033,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 14,000 | 26,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 36,000 | 36,000
Europe |  |  |  |  |  |  |  |  |  |
Sales to unaffiliated customers |  |  |  |  |  |  |  |  | 8,052,000 | 8,125,000
Operating income |  |  |  |  |  |  |  |  | 192,000 | (124,000)
Assets | 5,606,000 |  |  |  | 6,015,000 |  |  |  | 5,606,000 | 6,015,000
Additions to property, plant and equipment |  |  |  |  |  |  |  |  | 11,000 | 3,000
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 73,000 | $ 85,000

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