Note 10 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	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