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Note 10 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00%
Increase (Decrease) in Deferred Tax Assets | $ 689,000 |
Net Income (Loss) Attributable to Parent, Total | (5,201,021) | $ 5,261,411
Deferred Tax Assets, Gross, Total | 2,543,724 | 1,609,186
CVD Tantaline ApS [Member] | DENMARK |  |
Net Income (Loss) Attributable to Parent, Total | 463,000 | 865,000
Deferred Tax Assets, Gross, Total | $ 102,000 | $ 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 | $ 414,000 |

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