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Note 9 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Mar. 27, 2020
Deferred Tax Assets, Valuation Allowance, Total | $ 3,381,133 | $ 2,497,414 |
Income Taxes Receivable | 700,000 |  | $ 1,500,000
Net Income (Loss) Attributable to Parent, Total | (6,074,952) | (6,327,658) |
Deferred Tax Assets, Gross, Total | 3,937,609 | 2,939,900 |
CVD Tantaline ApS [Member] | DENMARK |  |  |
Net Income (Loss) Attributable to Parent, Total | 336,000 | (276,000) |
Deferred Tax Assets, Gross, Total | $ 74,000 | $ 61,000 |
CVD Tantaline ApS [Member] | DENMARK | Foreign Tax Authority [Member] | The Danish Ministry of Taxation [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Foreign Statutory Income Tax Rate, Percent | 22.00% |  |
Research [Member] |  |  |
Tax Credit Carryforward, Amount | $ 1,719,598 |  |

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