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Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended				3 Months Ended					6 Months Ended	7 Months Ended	9 Months Ended		12 Months Ended
	Nov. 03, 2021	Aug. 04, 2021	May 05, 2021	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	May 31, 2021	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Feb. 18, 2021
Share-based Payment Arrangement, Expense									$ 1.5			$ 2.8			$ 4.8	$ 5.2
Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period Used to Value Performance-based Awards (Year)						3 years
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)																2,800,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)															574,251	1,183,773
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation															$ 4.5	$ 2.7
Shares Withheld for Tax Withholding Obligation, Price Per Share (in dollars per share)					$ 7.88				$ 7.88			$ 2.32		$ 7.88	$ 7.88	$ 2.32
Silver-linked Dividend, Per Share, Increase (in dollars per share)			$ 0.01
Average Realized Silver Price Per Ounce (in dollars per share)					$ 25		$ 20		23.97	$ 27.14	$ 25.66
Common Stock, Dividends, Per Share, Declared (in dollars per share)									$ 0.01125			$ 0.0025			$ 0.03125	$ 0.00750
Dividends, Total					$ 6.0	$ 6.0
At-the-market Offering [Member]
Equity Distribution Agreement, Maximum Number of Shares to be Sold (in shares)																				60,000,000
Stock Issued During Period, Shares, New Issues (in shares)														0
Quarterly Dividends [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 1.125	0.01125
Quarterly Dividends, Common Stock, Cash, Silver Price-linked Component (in dollars per share)		0.00375	0.375
Quarterly Dividends, Common Stock, Cash, Minimum Annual Dividend Component (in dollars per share)		$ 0.75	$ 0.75
Quarterly Dividends [Member] \| Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.625
Quarterly Dividends, Common Stock, Cash, Silver Price-linked Component (in dollars per share)	0.375
Quarterly Dividends, Common Stock, Cash, Minimum Annual Dividend Component (in dollars per share)	$ 0.25
Forecast [Member]
Dividends, Total				$ 3.4
Restricted Stock Units, One [Member] \| Share-based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						552,660
Restricted Stock Units, One [Member] \| Share-based Payment Arrangement, Employee [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						177,872
Restricted Stock Units, One [Member] \| Share-based Payment Arrangement, Employee [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						177,878
Restricted Stock Units, One [Member] \| Share-based Payment Arrangement, Employee [Member] \| Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						196,910
Restricted Stock Units, Two [Member] \| Share-based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						47,590
Restricted Stock Units, Two [Member] \| Share-based Payment Arrangement, Employee [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage						50.00%
Restricted Stock Units, Two [Member] \| Share-based Payment Arrangement, Employee [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage						1.00%
Restricted Stock Units, Three [Member] \| Share-based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						29,187
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total						$ 5.0				$ 5.0
Restricted Stock Units (RSUs) [Member] \| Forecast [Member]
Share-based Payment Arrangement, Expense													$ 1.7				$ 0.2	$ 0.9	$ 2.2
Performance Shares [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)						30 months
Performance Shares [Member] \| Forecast [Member] \| Minimum [Member] \| June 2019 [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)								0
Performance Shares [Member] \| Forecast [Member] \| Maximum [Member] \| June 2019 [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)								1,200,000