Note 9 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 27, 2020	Dec. 31, 2019
Net Income (Loss) Attributable to Parent, Total	$ 1,658,478	$ (2,176,947)
Deferred Tax Assets, Valuation Allowance, Total				$ 2,497,414
Net Operating Loss, Tax Receivable Recognized Due to CARES Act			$ 1,500,000
CVD Tantaline ApS [Member] | DENMARK
Net Income (Loss) Attributable to Parent, Total	122,000	79,000
Deferred Tax Assets, Gross, Total	$ 27,000	$ 17,000
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%