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Note 3 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
 
 
Estimated
 
 
 
Useful Life (years)
 
Building and Building Improvements
 
5
40
 
Mining equipment
 
2
7
 
Office and shop furniture and equipment
 
3
7
 
Vehicles
 
 
5