Note 4 - Summary of Significant Accounting Policies - Property and Equipment (Details)	9 Months Ended
	Sep. 30, 2016
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	5 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	40 years
Mining Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Mining Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years
Vehicles [Member]
Property, Plant and Equipment, Useful Life	5 years