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Note 8 - Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Change in benefit obligation |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 29,641 |  |  | $ | 23,688 |  |  | $ | 23,492 |
Service cost (1) |  |  | 1,080 |  |  |  | 801 |  |  |  | 868 |
Interest cost |  |  | 820 |  |  |  | 884 |  |  |  | 802 |
Actuarial loss (gain) |  |  | 4,621 |  |  |  | 5,162 |  |  |  | (423 | )
Benefits paid |  |  | (1,310 | ) |  |  | (894 | ) |  |  | (1,051 | )
Projected benefit obligation at end of year |  | $ | 34,852 |  |  | $ | 29,641 |  |  | $ | 23,688 |
Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 25,007 |  |  | $ | 21,786 |  |  | $ | 23,428 |
Actual return on plan assets |  |  | 3,718 |  |  |  | 4,115 |  |  |  | (591 | )
Employer contribution |  |  | 5,000 |  |  |  | - |  |  |  | - |
Benefits paid |  |  | (1,310 | ) |  |  | (894 | ) |  |  | (1,051 | )
Fair value of plan assets at end of year |  | $ | 32,415 |  |  | $ | 25,007 |  |  | $ | 21,786 |
Funded status at the end of the year |  | $ | (2,437 | ) |  | $ | (4,634 | ) |  | $ | (1,902 | )
Amounts recognized in the Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset |  | $ | 512 |  |  | $ | 973 |  |  | $ | 399 |
Other liabilities |  |  | (2,437 | ) |  |  | (4,634 | ) |  |  | (1,902 | )
Total amounts recognized in the Consolidated Balance Sheet |  | $ | (1,925 | ) |  | $ | (3,661 | ) |  | $ | (1,503 | )
Amounts recognized in accumulated other comprehensive (loss), net |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (12,855 | ) |  | $ | (10,983 | ) |  | $ | (9,107 | )
Prior service cost |  |  | 11 |  |  |  | 120 |  |  |  | 230 |
Deferred tax asset |  |  | 2,697 |  |  |  | 2,281 |  |  |  | 1,864 |
Amount recognized |  | $ | (10,147 | ) |  | $ | (8,582 | ) |  | $ | (7,013 | )
Accrued/Prepaid benefit c ost, net |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation |  | $ | (34,852 | ) |  | $ | (29,641 | ) |  | $ | (23,688 | )
Fair value of assets |  |  | 32,415 |  |  |  | 25,007 |  |  |  | 21,789 |
Unrecognized net actuarial loss |  |  | 12,855 |  |  |  | 10,983 |  |  |  | 9,107 |
Unrecognized prior service cost |  |  | (11 | ) |  |  | (120 | ) |  |  | (230 | )
Deferred tax liability |  |  | (2,185 | ) |  |  | (1,308 | ) |  |  | (1,465 | )
Prepaid benefit cost included in other assets |  | $ | 8,222 |  |  | $ | 4,921 |  |  | $ | 5,510 |
Components of net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1,080 |  |  | $ | 801 |  |  | $ | 868 |
Interest cost |  |  | 820 |  |  |  | 884 |  |  |  | 802 |
Expected return on plan assets |  |  | (1,679 | ) |  |  | (1,461 | ) |  |  | (1,601 | )
Amortization of prior service cost |  |  | (110 | ) |  |  | (110 | ) |  |  | (110 | )
Recognized net actuarial loss |  |  | 710 |  |  |  | 632 |  |  |  | 585 |
Net periodic benefit cost |  | $ | 821 |  |  | $ | 746 |  |  | $ | 544 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | 1,871 |  |  | $ | 1,876 |  |  | $ | 1,184 |
Amortization of prior service cost |  |  | 110 |  |  |  | 110 |  |  |  | 110 |
Deferred income tax benefit |  |  | (416 | ) |  |  | (417 | ) |  |  | (272 | )
Total recognized |  | $ | 1,565 |  |  | $ | 1,569 |  |  | $ | 1,022 |
Total recognized in net periodic benefit cost and other comprehensive income |  | $ | 2,802 |  |  | $ | 2,732 |  |  | $ | 1,838 |
Weighted average assumptions at end of the year |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used for net periodic pension cost |  |  | 3.00 | % |  |  | 4.00 | % |  |  | 3.50 | %
Discount rate used for disclosure |  |  | 2.25 | % |  |  | 3.00 | % |  |  | 4.00 | %
Expected return on plan assets |  |  | 7.50 | % |  |  | 7.50 | % |  |  | 7.50 | %
Rate of compensation increase |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | %
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | Fair Value Measurements at December 31, 2020 |
Asset Category |  | Total |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash |  | $ | 4,336 |  |  | $ | 4,336 |  |  | $ | - |  |  | $ | - |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. companies |  |  | 15,129 |  |  |  | 15,129 |  |  |  | - |  |  |  | - |
International companies |  |  | 2,735 |  |  |  | 2,735 |  |  |  | - |  |  |  | - |
Equities mutual funds (1) |  |  | 3,840 |  |  |  | 3,840 |  |  |  | - |  |  |  | - |
State and political subdivisions |  |  | 152 |  |  |  | - |  |  |  | 152 |  |  |  | - |
Corporate bonds – investment grade (2) |  |  | 6,223 |  |  |  | - |  |  |  | 6,223 |  |  |  | - |
Total pension plan assets |  | $ | 32,415 |  |  | $ | 26,040 |  |  | $ | 6,375 |  |  | $ | - |
|  | Fair Value Measurements at December 31, 201 9 |
Asset Category |  | Total |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash |  | $ | 4,350 |  |  | $ | 4,350 |  |  | $ | - |  |  | $ | - |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. companies |  |  | 11,098 |  |  |  | 11,098 |  |  |  | - |  |  |  | - |
International companies |  |  | 2,334 |  |  |  | 2,334 |  |  |  | - |  |  |  | - |
Equities mutual funds (1) |  |  | 1,343 |  |  |  | 1,343 |  |  |  | - |  |  |  | - |
State and political subdivisions |  |  | 202 |  |  |  | - |  |  |  | 202 |  |  |  | - |
Corporate bonds – investment grade (2) |  |  | 5,680 |  |  |  | - |  |  |  | 5,680 |  |  |  | - |
Total pension plan assets |  | $ | 25,007 |  |  | $ | 19,125 |  |  | $ | 5,882 |  |  | $ | - |
Schedule of Expected Benefit Payments [Table Text Block] |
2021 |  |  | $ | 5,235 |
2022 |  |  | $ | 1,436 |
2023 |  |  | $ | 992 |
2024 |  |  | $ | 1,823 |
2025 |  |  | $ | 839 |
2026 - 2030 |  |  | $ | 10,725 |

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