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Note 12 - Segment Reporting - Segment Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Assets |  | $ 46,723,052 | $ 51,835,562
Revenue |  | 19,646,652 | 24,334,331
Operating (loss)/income |  | (4,984,715) | (5,254,519)
Pretax (loss)/income |  | (4,913,750) | (5,557,583)
Corporate, Non-Segment [Member] |  |  |
Assets |  |  |
Revenue |  |  |
Operating (loss)/income |  | (3,333,000) | (3,164,000)
Pretax (loss)/income |  | (3,333,000) | (3,164,000)
Intersegment Eliminations [Member] |  |  |
Assets | [1] | (9,000) | (9,000)
Revenue | [1] | (702,000) | (1,022,000)
Operating (loss)/income | [1] |  |
Pretax (loss)/income | [1] |  |
CVD [Member] | Operating Segments [Member] |  |  |
Assets |  | 34,374,000 | 39,788,000
Revenue |  | 14,065,000 | 17,860,000
Operating (loss)/income |  | (1,811,000) | (1,754,000)
Pretax (loss)/income |  | (1,782,000) | (1,691,000)
SDC [Member] | Operating Segments [Member] |  |  |
Assets |  | 6,003,000 | 4,870,000
Revenue |  | 4,498,000 | 5,503,000
Operating (loss)/income |  | 696,000 | 958,000
Pretax (loss)/income |  | 719,000 | 987,000
Materials [Member] | Operating Segments [Member] |  |  |
Assets |  | 6,355,000 | 7,187,000
Revenue |  | 1,786,000 | 1,993,000
Operating (loss)/income |  | (537,000) | (1,295,000)
Pretax (loss)/income |  | $ (518,000) | $ (1,690,000)
[1] | All elimination entries represent intersegment transactions eliminated in consolidation for external financial reporting.

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