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Note 11 - Retirement Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 4,006,948 | 6,130,944 |
Pension Plan [Member] | Gray Pension Plan [Member] |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 151 | $ 135 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 4 |  |
Capital Accumulation Plan [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | 13 | 11 | $ 6
Defined Contribution Plan, Expected Contributions In Next Twelve Months | $ 13 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 960,311 |  |
Capital Accumulation Plan [Member] | First 3% of Each Employee's Salary Deferral [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 1.00% |  |
Capital Accumulation Plan [Member] | Next 2% of Each Employee's Salary Deferral [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 5.00% |  |
Profit Sharing Contribution [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 6 | $ 5 | $ 4

X
- Definition Amount of the employer's best estimate of contributions expected to be paid to the plan in the next twelve months. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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X
- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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X
- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + 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 (g) -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 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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