Note 6 - Employee Benefit Plans - Fair Value by Asset Category (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Total fair value	$ 184,334	$ 176,958	$ 175,159
Fair Value, Inputs, Level 1 [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	109,396	103,962
Fair Value, Inputs, Level 1 [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	16,071	15,781
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	109,396	103,962
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	16,071	15,781
Fair Value Measured at Net Asset Value Per Share [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	157,402	150,377
Fair Value Measured at Net Asset Value Per Share [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	26,932	26,581
Interest-Bearing Deposits [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	2,699	525
Interest-Bearing Deposits [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	123	117
Interest-Bearing Deposits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	2,699	525
Interest-Bearing Deposits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	123	117
Common Stock [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	18,874	19,933
Common Stock [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	2,932	2,872
Common Stock [Member] \| Fair Value, Inputs, Level 1 [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	18,874	19,933
Common Stock [Member] \| Fair Value, Inputs, Level 1 [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	2,932	2,872
Mutual Funds [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	87,823	83,504
Mutual Funds [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	13,016	12,792
Mutual Funds [Member] \| Fair Value, Inputs, Level 1 [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	87,823	83,504
Mutual Funds [Member] \| Fair Value, Inputs, Level 1 [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	13,016	12,792
Real Estate Investments [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	16,318	18,029
Real Estate Investments [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	3,698	4,173
Real Estate Investments [Member] \| Fair Value, Inputs, Level 1 [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value		0
Real Estate Investments [Member] \| Fair Value, Inputs, Level 1 [Member] \| Lucky Friday Pension Plan [Member]
Total fair value		0
Common Collective Funds [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	31,688	28,386
Common Collective Funds [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	7,163	6,627
Common Collective Funds [Member] \| Fair Value, Inputs, Level 1 [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value		0
Common Collective Funds [Member] \| Fair Value, Inputs, Level 1 [Member] \| Lucky Friday Pension Plan [Member]
Total fair value		0
Investments Measured At Net Asset Value [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value	48,006	46,415
Investments Measured At Net Asset Value [Member] \| Lucky Friday Pension Plan [Member]
Total fair value	$ 10,861	10,800
Investments Measured At Net Asset Value [Member] \| Fair Value, Inputs, Level 1 [Member] \| Hecla Mining Company Retirement Plan [Member]
Total fair value		0
Investments Measured At Net Asset Value [Member] \| Fair Value, Inputs, Level 1 [Member] \| Lucky Friday Pension Plan [Member]
Total fair value		$ 0