Note 9 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Income (Loss) Attributable to Parent, Total	$ (2,176,947)	$ 558,404
CVD Tantaline ApS [Member] | DENMARK
Net Income (Loss) Attributable to Parent, Total	79,000	47,000
Deferred Tax Assets, Gross, Total	$ 17,000	$ 10,000
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%