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Note 9 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Deferred Tax Assets, Valuation Allowance, Total | $ 2,497,414 |
Deferred Income Tax Assets, Net, Total |  | 1,425,414
Retained Earnings (Accumulated Deficit), Ending Balance | 3,172,054 | 9,499,712
Net Income (Loss) Attributable to Parent, Total | (6,327,658) | (5,201,021)
Deferred Tax Assets, Gross, Total | 2,939,900 | 1,864,724
CVD Tantaline ApS [Member] | DENMARK |  |
Net Income (Loss) Attributable to Parent, Total | (276,000) | (463,000)
Deferred Tax Assets, Gross, Total | $ 61,000 | 102,000
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% |
Restatement Adjustment [Member] |  |
Deferred Income Tax Assets, Net, Total |  | (679,000)
Retained Earnings (Accumulated Deficit), Ending Balance |  | $ (679,000)
Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | $ 588,000 |

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