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Note 13 - Segment Reporting - Segment Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Assets |  | $ 52,514,562 | $ 58,978,250
Revenue |  | 24,334,331 | 41,128,639
Operating (loss)/income |  | (5,254,519) | 7,218,873
Pretax (loss)/income |  | (5,557,583) | 7,195,355
Corporate, Non-Segment [Member] |  |  |
Assets |  |  | 1,609,000
Revenue |  |  |
Operating (loss)/income |  | (3,164,000) | (2,615,000)
Pretax (loss)/income |  | (3,164,000) | (2,615,000)
Intersegment Eliminations [Member] |  |  |
Assets | [1] | (9,000) | (1,000)
Revenue | [1] | (1,022,000) | (1,996,000)
Operating (loss)/income | [1] |  |
Pretax (loss)/income | [1] |  |
CVD [Member] | Operating Segments [Member] |  |  |
Assets |  | 40,467,000 | 42,152,000
Revenue |  | 17,860,000 | 34,965,000
Operating (loss)/income |  | (1,754,000) | 9,232,000
Pretax (loss)/income |  | (1,691,000) | 9,243,000
SDC [Member] | Operating Segments [Member] |  |  |
Assets |  | 4,870,000 | 5,850,000
Revenue |  | 5,503,000 | 7,427,000
Operating (loss)/income |  | 958,000 | 2,008,000
Pretax (loss)/income |  | 987,000 | 2,011,000
Materials [Member] | Operating Segments [Member] |  |  |
Assets |  | 7,187,000 | 9,368,000
Revenue |  | 1,993,000 | 733,000
Operating (loss)/income |  | (1,295,000) | (1,406,000)
Pretax (loss)/income |  | $ (1,690,000) | $ (1,444,000)
[1] | All elimination entries represent intersegment transactions eliminated in consolidation for external financial reporting.

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