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Note 10 - Debt, Credit Facility and Capital Leases (Details Textual)
$ in Millions
9 Months Ended 12 Months Ended
Jul. 31, 2018
USD ($)
Apr. 12, 2013
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2014
USD ($)
Jan. 01, 2020
Jul. 20, 2018
USD ($)
Mar. 05, 2018
USD ($)
Mar. 05, 2018
CAD ($)
Dec. 31, 2017
USD ($)
May 31, 2016
USD ($)
Letters of Credit Outstanding, Amount     $ 3,000,000                
Capital Lease Obligations, Total     14,656,000             $ 11,800,000  
Capital Lease Obligations, Current     6,069,000             5,608,000  
Capital Lease Obligations, Noncurrent     8,638,000             $ 6,193,000  
Capital Leases, Future Minimum Payments Due, Total     15,675,000                
Capital Leases, Future Minimum Payments, Interest Included in Payments     $ 1,019,000                
Klondex Mines Ltd [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt             $ 35,086,000        
Maximum [Member]                      
Leverage Ratio [1]     4.5                
Revolving Credit Facility [Member]                      
Line of Credit Facility, Current Borrowing Capacity $ 200,000,000                    
Line of Credit Facility, Maximum Borrowing Capacity 250,000,000                   $ 100,000,000
Long-term Line of Credit, Total 47,000,000   $ 0                
Revolving Credit Facility [Member] | Klondex Mines Ltd [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt             $ 35,000,000        
Repayments of Lines of Credit $ 35,000,000                    
Revolving Credit Facility [Member] | Scenario, Forecast [Member]                      
Leverage Ratio           4          
Letter of Credit [Member]                      
Letter of Credit Outstanding, Fronting Fee 0.20%                    
Letter of Credit [Member] | Minimum [Member]                      
Letter of Credit, Participation Fee, Percent 2.25%                    
Letter of Credit [Member] | Maximum [Member]                      
Letter of Credit, Participation Fee, Percent 3.25%                    
Senior Notes [Member]                      
Debt Instrument, Face Amount   $ 500,000,000                  
Payment for Pension Benefits         $ 6,500,000            
Proceeds from Issuance of Senior Long-term Debt   $ 490,000,000                  
Underwriting Discount on Senior Notes   2.00%                  
Debt Instrument, Unamortized Discount, Total   $ 10,000,000 3,300,000                
Debt Instrument, Interest Rate, Stated Percentage   6.875%                  
Interest Expense, Debt, Total     $ 27,200,000 $ 26,300,000              
Interest Costs Capitalized       900,000              
Debt Instrument, Redemption Price, Percentage     101.00%                
Senior Notes [Member] | Costs Related to Private Offering and Tender Offer [Member]                      
Interest Expense, Debt, Total       $ 1,100,000              
Series 2018-A Senior Notes [Member]                      
Debt Instrument, Face Amount               $ 30,800,000 $ 40.0    
Debt Instrument, Unamortized Discount, Total                 $ 0.2    
Debt Instrument, Interest Rate, Stated Percentage               4.68% 4.68%    
Interest Expense, Debt, Total     $ 1,100,000                
Debt Instrument, Issuance, Discount Rate               0.58% 0.58%    
[1] The leverage ratio will change to 4.00:1 effective January 1, 2020.