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Note 9 - Shareholders' Equity (Details Textual)			1 Months Ended	3 Months Ended			9 Months Ended		31 Months Ended	77 Months Ended
Note 9 - Shareholders' Equity (Details Textual)	Nov. 06, 2018 USD ($) $ / shares	Jul. 20, 2018 $ / shares shares	Mar. 31, 2018 USD ($) shares	Sep. 30, 2018 $ / shares $ / item shares	Aug. 31, 2018 USD ($) shares	Sep. 30, 2017 $ / shares shares	Sep. 30, 2018 USD ($) $ / shares $ / item shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / item shares	Sep. 30, 2018 $ / shares $ / item shares	Feb. 23, 2016 USD ($)	May 08, 2012 shares
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			1,237,369
Allocated Share-based Compensation Expense, Total \| $			$ 4,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period Used to Value Performance-based Awards					3 years
Shares Paid for Tax Withholding for Share Based Compensation							697,341	588,240
Payments Related to Tax Withholding for Share-based Compensation \| $							$ 2,700,000	$ 3,000,000
Treasury Stock Acquired, Average Cost Per Share \| $ / shares							$ 3.86	$ 5.09
Common Stock, Dividends, Per Share, Declared \| $ / shares				$ 0.0025		$ 0.0025	$ 0.0075	$ 0.0075
Average Realized Silver Price \| $ / item							14.68
Average Realized Silver Price, Minimum Dividend, Threshold \| $ / item				30			30		30	30
Stock Issued During Period, Shares, New Issues							1,025,911		5,634,758
Stock Issued During Period, Value, New Issues \| $							$ 3,100,000		$ 20,800,000
Payments for Brokerage Fees \| $							$ 100,000		$ 500,000
Class of Warrant or Right, Outstanding						0		0
Klondex Mines Ltd [Member]
Stock Issued During Period, Shares, New Issues		75,276,176
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares		$ 8.02
Warrants in Connection with Klondex Mines Acquisition [Member]
Class of Warrant or Right, Issued During Period		4,136,000
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right		1
Warrants in Connection with Klondex Mines Acquisition Expiring April 2032 [Member]
Class of Warrant or Right, Outstanding		2,068,000
Warrants in Connection with Klondex Mines Acquisition Expiring February 2029 [Member]
Class of Warrant or Right, Outstanding		2,068,000
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares		$ 1.57
Common Stock Repurchase Program [Member]
Treasury Stock Acquired, Average Cost Per Share \| $ / shares										$ 3.99
Stock Repurchase Program, Number of Shares Authorized to be Repurchased												20,000,000
Cumulative Stock Repurchased				934,100			934,100		934,100	934,100
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased				19,100,000			19,100,000		19,100,000	19,100,000
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared \| $ / shares	$ 0.0025
Dividends, Common Stock, Total \| $	$ 1.20
Subsequent Event [Member] \| Common Stock Repurchase Program [Member]
Share Price \| $ / shares	$ 2.49
Minimum [Member]
Common Stock, Dividends, Per Share, Declared \| $ / shares							$ 0.01
Maximum [Member]
Common Stock, Aggregate Offering Price \| $											$ 75,000,000
Restricted Stock Units (RSUs) [Member]
Allocated Share-based Compensation Expense, Total \| $					$ 7,000,000
Restricted Stock Units RSUs, Vesting In June 2019, June 2020, and June 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					1,854,054
Restricted Stock Units RSUs, Vesting In June 2019, June 2020, and June 2021 [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					33.00%
Restricted Stock Units RSUs, Vesting In June 2019, June 2020, and June 2021 [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					33.00%
Restricted Stock Units RSUs, Vesting In June 2019, June 2020, and June 2021 [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					33.00%
Restricted Stock Units RSUs, Vesting in June 2019 and June 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					96,604
Restricted Stock Units RSUs, Vesting in June 2019 and June 2020 [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					50.00%
Restricted Stock Units RSUs, Vesting in June 2019 and June 2020 [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					50.00%
Restricted Stock Units RSUs, Vesting in June 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					28,721
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options \| $					$ 2,500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					1 year
Restricted Stock Units (RSUs) Vesting in June 2020 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options \| $					$ 2,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					2 years
Restricted Stock Units (RSUs) Vesting in June 2021 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options \| $					$ 2,200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					3 years
Performance Shares [Member]
Allocated Share-based Compensation Expense, Total \| $							$ 4,700,000	$ 4,900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					2 years 180 days