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Note 12 - Segment Reporting - Segment Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Assets |  | $ 40,935,925 | $ 46,723,052
Revenue |  | 16,920,219 | 19,646,652
Operating (loss)/income |  | (7,823,957) | (4,984,715)
Pretax (loss)/income |  | (7,602,307) | (4,913,750)
Corporate, Non-Segment [Member] |  |  |
Assets |  |  |
Revenue |  |  |
Operating (loss)/income |  | (3,151,000) | (3,333,000)
Pretax (loss)/income |  | (3,151,000) | (3,333,000)
Intersegment Eliminations [Member] |  |  |
Assets | [1] | (9,000) | (9,000)
Revenue | [1] | (450,000) | (702,000)
Operating (loss)/income | [1] |  |
Pretax (loss)/income | [1] |  |
CVD [Member] | Operating Segments [Member] |  |  |
Assets |  | 31,284,000 | 34,374,000
Revenue |  | 10,385,000 | 14,065,000
Operating (loss)/income |  | (863,000) | (1,811,000)
Pretax (loss)/income |  | (878,000) | (1,782,000)
SDC [Member] | Operating Segments [Member] |  |  |
Assets |  | 6,068,000 | 6,003,000
Revenue |  | 4,429,000 | 4,498,000
Operating (loss)/income |  | 473,000 | 696,000
Pretax (loss)/income |  | 481,000 | 719,000
Materials [Member] | Operating Segments [Member] |  |  |
Assets |  | 3,593,000 | 6,355,000
Revenue |  | 2,556,000 | 1,786,000
Operating (loss)/income |  | (4,283,000) | (537,000)
Pretax (loss)/income |  | $ (4,054,000) | $ (518,000)
[1] | All elimination entries represent intersegment transactions eliminated in consolidation for external reporting. 2020 Materials segment includes an impairment charge of $3.6 million related to the Tantaline product line

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