Note 4 - Property and Equipment (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 31, 2017

Notes Tables

Property, Plant, And Equipment, Carrying Value [Table Text Block]

	June 30,			December 31,
	2018			2017
Land	$	500,000		$	500,000
Land improvements		171,122			171,122
Buildings		3,129,519			3,129,519
Mining equipment		1,784,115			1,784,115
Milling equipment		2,841,726			2,841,726
Laboratory equipment		607,716			607,716
Office equipment		70,529			70,529
Vehicles		150,810			150,810
		9,255,537			9,255,537
Less: Accumulated depreciation		(7,098,108	)		(6,453,146	)
Total	$	2,157,429		$	2,802,391

	December 31,
	2017			2016
Land	$	500,000		$	500,000
Land improvements		171,122			171,122
Buildings		3,129,519			3,129,519
Mining equipment		1,784,115			1,775,884
Milling equipment		2,841,726			2,806,834
Laboratory equipment		607,716			607,716
Office equipment		70,529			69,900
Vehicles		150,810			150,810
		9,255,537			9,211,785
Less: Accumulated depreciation		(6,453,146	)		(5,136,609	)
Total	$	2,802,391		$	4,075,176