Note 4 - Property and Equipment - Property, Plant, and Equipment, Net (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2014
Property, Plant and Equipment, Gross	$ 9,255,537	$ 9,255,537	$ 9,211,785
Less: Accumulated depreciation	(7,098,108)	(6,453,146)	(5,136,609)
Total	2,157,429	2,802,391	4,075,176
Land [Member]
Property, Plant and Equipment, Gross	500,000	500,000	500,000
Land Improvements [Member]
Property, Plant and Equipment, Gross	171,122	171,122	171,122
Building [Member]
Property, Plant and Equipment, Gross	3,129,519	3,129,519	3,129,519
Mining Equipment [Member]
Property, Plant and Equipment, Gross	1,784,115	1,784,115	1,775,884	$ 65,120
Milling Equipment [Member]
Property, Plant and Equipment, Gross	2,841,726	2,841,726	2,806,834
Laboratory Equipment [Member]
Property, Plant and Equipment, Gross	607,716	607,716	607,716
Office Equipment [Member]
Property, Plant and Equipment, Gross	70,529	70,529	69,900
Vehicles [Member]
Property, Plant and Equipment, Gross	$ 150,810	$ 150,810	$ 150,810

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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