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Note 8 - Benefit Plans - Defined Benefit Plans Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Benefit obligation at beginning of year | $ 28,470 | $ 27,125 |
Service cost - benefits earned during the period | 152 | 117 |
Interest cost on projected benefit obligation | 863 | 1,084 |
Actuarial loss | 5,383 | 3,835 |
Benefits paid | (1,753) | (3,691) |
Benefit obligation at end of year | 33,115 | 28,470 | $ 27,125
Fair value of plan assets at beginning of year | 19,939 | 19,980 |
Actual return on assets | 462 | 3,547 |
Employer contributions | 103 | 103 |
Benefits paid | (1,750) | (3,691) |
Fair value of plan assets at end of year | 18,754 | 19,939 | 19,980
Funded status at end of year | (14,361) | (8,531) |
Other assets | 314 | 1,825 |
Other current liabilities | (101) | (103) |
Long-term pension liability | (14,574) | (10,253) |
Net amount recognized | (14,361) | (8,531) |
Net actuarial loss | 15,656 | 10,828 |
Pension Plan [Member] |  |  |
Benefit obligation at beginning of year | 18,114 | 18,317 |
Service cost - benefits earned during the period | 0 | 0 |
Interest cost on projected benefit obligation | 541 | 721 | 675
Actuarial loss | 1,773 | 2,664 |
Benefits paid | (1,650) | (3,588) |
Benefit obligation at end of year | 18,778 | 18,114 | 18,317
Fair value of plan assets at beginning of year | 19,939 | 19,980 |
Actual return on assets | 462 | 3,547 |
Employer contributions | 0 | 0 |
Benefits paid | (1,647) | (3,588) |
Fair value of plan assets at end of year | 18,754 | 19,939 | 19,980
Funded status at end of year | (24) | 1,825 |
Other assets | 314 | 1,825 |
Other current liabilities | 0 | 0 |
Long-term pension liability | (338) | 0 |
Net amount recognized | (24) | 1,825 |
Net actuarial loss | 8,227 | 6,312 |
Supplemental Employee Retirement Plan [Member] |  |  |
Benefit obligation at beginning of year | 10,356 | 8,808 |
Service cost - benefits earned during the period | 152 | 117 | 108
Interest cost on projected benefit obligation | 322 | 363 | 295
Actuarial loss | 3,610 | 1,171 |
Benefits paid | (103) | (103) |
Benefit obligation at end of year | 14,337 | 10,356 | 8,808
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on assets | 0 | 0 |
Employer contributions | 103 | 103 |
Benefits paid | (103) | (103) |
Fair value of plan assets at end of year | 0 | 0 | $ 0
Funded status at end of year | (14,337) | (10,356) |
Other assets | 0 | 0 |
Other current liabilities | (101) | (103) |
Long-term pension liability | (14,236) | (10,253) |
Net amount recognized | (14,337) | (10,356) |
Net actuarial loss | $ 7,429 | $ 4,516 |

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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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