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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%