Note 12 - Stockholders' Equity (Details Textual)	1 Months Ended			3 Months Ended	12 Months Ended					28 Months Ended
	Feb. 29, 2024 USD ($)	Feb. 28, 2023 USD ($)	Sep. 30, 2021 $ / shares	Dec. 31, 2020 $ / shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) Director $ / shares shares	Dec. 31, 2020 $ / shares	Dec. 31, 2019 $ / shares	Dec. 31, 2024 USD ($) $ / shares shares	Feb. 15, 2022 $ / shares	Feb. 18, 2021 shares	Sep. 30, 2020 $ / shares	Jul. 20, 2018 shares	May 08, 2012 shares	Jun. 30, 2010 shares
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares				$ 0.015	$ 0.01				$ 0.01
Average Realized Silver Price, Minimum Dividend, Threshold (in dollars per share) | $ / shares									$ 30				$ 25
Average Realized Silver Price Per Ounce (in dollars per share) | $ / shares			$ 20					$ 25
Stock Issued During Period, Shares, New Issues (in shares) | shares					1,488,050
Share Price (in dollars per share) | $ / shares											$ 0
Series B preferred stock, shares outstanding (in shares) | shares					157,756	157,776				157,756
Percent of Shareholders' Consent Needed to Create or Issue Stock Ranking Senior to Series B Preferred Stock					66.00%					66.00%
Preferred stock, dividends declared (Quarterly)					$ 552,000	$ 552,000	$ 552,000
Series B preferred stock, liquidation preference					7,889,000	7,889,000				$ 7,889,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					$ 5,600,000					$ 5,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period Used to Value Performance-based Awards (Year)					3 years
warrant holder | shares					2,068,000					2,068,000
Warrants exercise price per share | $ / shares					$ 8.02					$ 8.02
Number of series B preffered stock coverted | shares					20		40
Common stock issued upon conversion of series B preffered stock | shares					64		128
Unrecognized Tax Benefits, Interest on Income Taxes Expense					$ 6,800,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition					2 years
Restricted Stock Units Vested					$ 4,700,000	$ 4,600,000	$ 5,800,000
Distributed	$ 700,000	$ 1,000,000
Warrants in Connection with Klondex Mines Acquisition [Member]
Class of Warrant or Right, Issued During Period (in shares) | shares					2,068,000	4,136,000
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares														1
Warrants exercise price per share | $ / shares					$ 1.57					$ 1.57
Satisfy Withholding Obligations [Member]
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares					$ 4.31	$ 5.03	$ 4.99
Stock Repurchased During Period, Shares (in shares) | shares					277,966,000	404,514	73,725
Stock Repurchased During Period, Value					$ 1,200,000	$ 2,000,000	$ 3,700,000
2010 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares																20,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares					10,175,414					10,175,414
Directors Stock Plan [Member]
Number of distributed shares | shares							388,175
Number of directors | Director							2
Share-based Payment Arrangement, Expense					$ 800,000	$ 700,000	$ 400,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares					2,039,789					2,039,789
Share-Based Compensation Arrangement by Share-Based Payment Award, Method of Measuring Cost of Award Participant, Numerator					$ 120,000
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture (in shares) | shares					150,387	125,063	98,310
Share-Based Payment Arrangement [Member]
Share-based Payment Arrangement, Expense					$ 8,700,000	$ 6,600,000	$ 6,000,000
Performance Shares [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense					$ 1,600,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition					1 year 7 months 6 days
Series B Preferred Stock [Member]
Series B preferred stock, shares outstanding (in shares) | shares					157,756	157,776				157,756
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ / shares					$ 3.5
Preferred stock, dividends declared (Quarterly)					$ 552,000	$ 552,000	$ 552,000
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares					$ 50					$ 50
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares							$ 50
Series B preferred stock, liquidation preference					$ 7,900,000					$ 7,900,000
Preferred Stock Conversion Price (in dollars per share) | $ / shares					$ 15.55					$ 15.55
Common Stock Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares															20
Cumulative Stock Repurchased (in shares) | shares					934,100					934,100
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares					$ 3.99
At-the-market Offering [Member]
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares) | shares					9,339,287					9,339,287		60
At-the-market Offering [Member] | September 2022 through December 31, 2023 [Member]
Payments of Stock Issuance Costs										$ 2,100,000
At-the-market Offering [Member] | September 2022 through December 31, 2024 [Member]
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares) | shares					23,843,684,000					23,843,684,000
Proceeds from Issuance or Sale of Equity										$ 132,300,000
At-the-market Offering [Member] | At The Market Equity Distribution Agreement [Member]
Proceeds from Issuance or Sale of Equity					$ 58,400,000
Payments of Stock Issuance Costs					900,000
O2024Q4Dividends [Member]
Dividends, Common Stock, Total					$ 25,500,000
O2023Q4Dividends [Member]
Dividends, Common Stock, Total						$ 15,700,000
O2022Q4Dividends [Member]
Dividends, Common Stock, Total							$ 12,900,000