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Note 1 - Organization and Description of Business (Details Textual)
3 Months Ended
Dec. 22, 2017
USD ($)
Mar. 31, 2018
T
Mar. 31, 2017
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] | Largest Customer [Member] | Sales Revenue, Net [Member]      
Concentration Risk, Percentage   47.00% 55.00%
Customer Concentration Risk [Member] | Largest Customer [Member] | Accounts Receivable [Member]      
Concentration Risk, Percentage   0.00% 62.00%
AMIRON Products [Member]      
Mineral Processing Plant, Annual Capacity | T   45,000  
Halloysite Resource [Member] | Minimum [Member]      
Mineral Processing Plant, Annual Capacity | T   5,000  
Halloysite Resource [Member] | Maximum [Member]      
Mineral Processing Plant, Annual Capacity | T   10,000