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Note 5 - Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Defined Benefit Plan [Abstract] |
Schedule of changes in the plans' benefit obligations and fair value of assets |
|  | Pension Benefits |
|  | 2022 |  |  | 2021 |
Change in benefit obligation: |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 195,862 |  |  | $ | 192,954 |
Service cost |  |  | 6,262 |  |  |  | 5,820 |
Interest cost |  |  | 5,476 |  |  |  | 4,990 |
Amendments |  |  | 0 |  |  |  | 550 |
Change due to mortality change |  |  | 486 |  |  |  | 548 |
Change due to discount rate change |  |  | (54,977 | ) |  |  | (5,865 | )
Actuarial return (loss) |  |  | 1,841 |  |  |  | 4,342 |
Benefits paid |  |  | (6,807 | ) |  |  | (7,477 | )
Benefit obligation at end of year |  |  | 148,143 |  |  |  | 195,862 |
Change in fair value of plan assets: |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  | 189,874 |  |  |  | 148,052 |
Actual return on plan assets |  |  | (18,238 | ) |  |  | 27,049 |
Employer contributions |  |  | 10,330 |  |  |  | 22,250 |
Benefits paid |  |  | (6,807 | ) |  |  | (7,477 | )
Fair value of plan assets at end of year |  |  | 175,159 |  |  |  | 189,874 |
Funded/(underfunded) status at end of year |  | $ | 27,016 |  |  | $ | (5,988 | )
Schedule of the amounts recognized in the consolidated balance sheets |
|  | Pension Benefits |
|  | 2022 |  |  | 2021 |
Non-current assets: |  |  |  |  |  |
Accrued benefit asset |  | $ | 27,806 |  |  | $ | — |
Current pension liability |  |  |  |  |  |
Accrued benefit liability |  |  | (790 | ) |  |  | (1,315 | )
Non- current pension liability: |  |  |  |  |  |
Accrued benefit liability |  |  | — |  |  |  | (4,673 | )
Accumulated other comprehensive loss |  |  | 6,446 |  |  |  | 29,966 |
Net amount recognized |  | $ | 33,462 |  |  | $ | 23,978 |
Schedule of assumptions related to benefit obligation and prepaid benefit costs |
|  | Pension Benefits |
|  | 2022 |  |  |  | 2021 |
Discount rate: net periodic pension cost |  |  | 5.54 | % |  |  |  | 2.64 | %
Discount rate: projected benefit obligation |  |  | 5.54 | % |  |  |  | 2.86 | %
Expected rate of return on plan assets |  |  | 7.25 | % |  |  |  | 6.40 | %
Rate of compensation increase: net periodic pension cost |  | 5.00%/2.00% |  | (1) |  | 5.00%/2.00% |
Rate of compensation increase: projected benefit obligation |  | 5.00%/2.00% |  | (1) |  | 5.00%/2.00% |
Schedule of net periodic pension cost |
|  | Pension Benefits |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Service cost |  | $ | 6,262 |  |  | $ | 5,820 |  |  | $ | 5,334 |
Interest cost |  |  | 5,476 |  |  |  | 4,990 |  |  |  | 5,618 |
Expected return on plan assets |  |  | (13,452 | ) |  |  | (9,252 | ) |  |  | (7,489 | )
Amortization of prior service benefit |  |  | 511 |  |  |  | 394 |  |  |  | 117 |
Amortization of net gain from earlier periods |  |  | 2,049 |  |  |  | 4,502 |  |  |  | 4,652 |
Net periodic pension cost |  | $ | 846 |  |  | $ | 6,454 |  |  | $ | 8,232 |
Schedule of allocation of assets |
|  | Target |  |  | Maximum |
Large cap U.S. equities |  |  | 17 | % |  |  | 20 | %
Small cap U.S. equities |  |  | 8 | % |  |  | 10 | %
Non-U.S. equities |  |  | 25 | % |  |  | 30 | %
U.S. Fixed income |  |  | 18 | % |  |  | 23 | %
Emerging markets debt |  |  | 5 | % |  |  | 8 | %
Real estate |  |  | 15 | % |  |  | 18 | %
Absolute return |  |  | 5 | % |  |  | 7 | %
Company stock/Real return |  |  | 7 | % |  |  | 13 | %
Schedule of fair values of plan by asset category |
|  | Hecla plans |  |  | Lucky Friday |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Investments measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest-bearing cash |  | $ | 743 |  |  | $ | — |  |  | $ | — |  |  | $ | 743 |  |  | $ | 133 |  |  | $ | — |  |  | $ | — |  |  | $ | 133 |
Common stock |  |  | 21,678 |  |  |  | — |  |  |  | — |  |  |  | 21,678 |  |  |  | 3,295 |  |  |  | — |  |  |  | — |  |  |  | 3,295 |
Mutual funds |  |  | 75,868 |  |  |  | — |  |  |  | — |  |  |  | 75,868 |  |  |  | 11,905 |  |  |  | — |  |  |  | — |  |  |  | 11,905 |
Total investments in the fair value hierarchy |  |  | 98,289 |  |  |  | — |  |  |  | — |  |  |  | 98,289 |  |  |  | 15,333 |  |  |  | — |  |  |  | — |  |  |  | 15,333 |
Investments measured at net asset value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 23,967 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,550 |
Hedge funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Common collective funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 26,114 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,906 |
Total investments measured at net asset value |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 50,081 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 11,456 |
Total fair value |  | $ | 98,289 |  |  | $ | — |  |  | $ | — |  |  | $ | 148,370 |  |  | $ | 15,333 |  |  | $ | — |  |  | $ | — |  |  | $ | 26,789 |
|  | Hecla |  |  | Lucky Friday |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Investments measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest-bearing cash |  | $ | 1,835 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,835 |  |  | $ | 305 |  |  | $ | — |  |  | $ | — |  |  | $ | 305 |
Common stock |  |  | 8,869 |  |  |  | — |  |  |  | — |  |  |  | 8,869 |  |  |  | 1,580 |  |  |  | — |  |  |  | — |  |  |  | 1,580 |
Mutual funds |  |  | 96,957 |  |  |  | — |  |  |  | — |  |  |  | 96,957 |  |  |  | 15,707 |  |  |  | — |  |  |  | — |  |  |  | 15,707 |
Total investments in the fair value hierarchy |  |  | 107,661 |  |  |  | — |  |  |  | — |  |  |  | 107,661 |  |  |  | 17,592 |  |  |  | — |  |  |  | — |  |  |  | 17,592 |
Investments measured at net asset value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 19,119 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,482 |
Hedge funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12,866 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,828 |
Common collective funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 20,626 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,700 |
Total investments measured at net asset value |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 52,611 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12,010 |
Total fair value |  | $ | 107,661 |  |  | $ | — |  |  | $ | — |  |  | $ | 160,272 |  |  | $ | 17,592 |  |  | $ | — |  |  | $ | — |  |  | $ | 29,602 |
Schedule of estimates of future benefit payments |
Year Ending December 31, |  | Pension Plans |
2023 |  | $ | 8,429 |
2024 |  |  | 8,796 |
2025 |  |  | 9,649 |
2026 |  |  | 9,819 |
2027 |  |  | 9,803 |
Years 2028-2032 |  |  | 50,279 |
Schedule of indication of whether pension plans had accumulated benefit obligations (ABO) in excess of plan assets, or plan assets exceeded ABO |
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | ABO Exceeds Plan Assets |  |  | Plan Assets Exceed ABO |  |  | ABO Exceeds Plan Assets |  |  | Plan Assets Exceed ABO |
Projected benefit obligation |  | $ | — |  |  | $ | 148,143 |  |  | $ | 195,862 |  |  | $ | — |
Accumulated benefit obligation |  |  | — |  |  |  | 144,816 |  |  |  | 191,597 |  |  |  | — |
Fair value of plan assets |  |  | — |  |  |  | 175,159 |  |  |  | 189,874 |  |  |  | — |
Schedule of amounts included in "Accumulated other comprehensive loss, net" |
|  | Pension Benefits |
Unamortized net (gain)/loss |  | $ | 5,377 |
Unamortized prior service cost |  |  | 1,069 |

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