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Note 10 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% |
Increase (Decrease) in Deferred Tax Assets |  | $ (689,000) |
Net Income (Loss) Attributable to Parent |  | 5,261,411 | $ (149,124)
Deferred Tax Assets, Gross |  | 1,609,186 | 2,915,334
CVD Tantaline ApS [Member] | DENMARK |  |  |
Net Income (Loss) Attributable to Parent |  | (865,000) | $ 0
Deferred Tax Assets, Gross |  | $ 190,000 |
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 Tax Credit Carryforward [Member] |  |  |
Tax Credit Carryforward, Amount |  | $ 427,000 |
Scenario, Forecast [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |

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