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Note 3 - Basis of Reporting and Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2018
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