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Note 1 - Organization and Description of Business (Details Textual)
6 Months Ended
Dec. 22, 2017
USD ($)
Jun. 30, 2018
T
CMC [Member]    
Exploration Agreement, Payments Upon Expiration of Due Diligence Period $ 350,000  
Exploration Agreement, Payments on or Before First Anniversary of Effective Date of Agreement 150,000  
Exploration Agreement, Payments on or Before Each Subsequent Anniversary of Effective Date During Exploration License Term $ 250,000  
Exploration Agreement, Option to Purchase, Percentage of Metallic Rights 100.00%  
Exploration Agreement, Option to Purchase, Consideration $ 3,000,000  
Exploration Agreement, Option to Purchase, Percentage of Net Profits Interest Royalty Granted 5.00%  
Exploration Agreement, Option to Purchase, NPI Royalty Cap $ 20,000,000  
Exploration Agreement, NPI Royalty Interest Converted to Shares of Properties, Value $ 2,000,000  
Exploration Agreement, NPI Royalty Interest Converted to Shares of Properties, Percentage, Maximum 2.00%  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]    
Number of Major Customers   2
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Two Largest Customers [Member]    
Concentration Risk, Percentage   63.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]    
Number of Major Customers   2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Largest Customers [Member]    
Concentration Risk, Percentage   0.00%
AMIRON Products [Member]    
Mineral Processing Plant, Annual Capacity | T   45,000
Halloysite Resource [Member] | Maximum [Member]    
Mineral Processing Plant, Annual Capacity | T   10,000