Note 6 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	2 Months Ended	12 Months Ended
	Feb. 17, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Expected rate of return on plan assets	7.25%	7.25%	7.25%
Defined Benefit Plan Assumed Long Term Rate Basis Spread		1.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 0	$ 1,756
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		55.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		6.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 1,600	1,300	$ 600
Capital Accumulation 401(K) Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 4,800	4,600	4,500
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		6.00%
Pension plans
Defined Benefit Plan, Plan Assets, Contributions by Employer			1,000
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 800
Common Stock [Member] | Supplemental Employee Retirement Plan [Member]
Common stock investments		18,900	19,900
Hecla Plans
Defined Benefit Plan, Plan Assets, Contributions by Employer		200
Hecla Plans | Common Stock [Member]
Common stock investments		18,900	19,900
Lucky Friday plan | Common Stock [Member]
Common stock investments		2,900	2,900
Nonoperating Income (Expense) [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Except Service cost		$ 3,900	$ 4,100	$ 5,400