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v3.21.1

Note A - Overview and Significant Accounting Policies - Property, Plant and Equipment (Details) | 12 Months Ended
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Dec. 31, 2020
Minimum [Member] | Building and Building Improvements [Member] |
Estimated useful lives (Year) | 3 years
Minimum [Member] | Software and Software Development Costs [Member] |
Estimated useful lives (Year) | 2 years
Minimum [Member] | Furniture and Fixtures [Member] |
Estimated useful lives (Year) | 3 years
Maximum [Member] | Building and Building Improvements [Member] |
Estimated useful lives (Year) | 40 years
Maximum [Member] | Software and Software Development Costs [Member] |
Estimated useful lives (Year) | 10 years
Maximum [Member] | Furniture and Fixtures [Member] |
Estimated useful lives (Year) | 20 years

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |