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Note B - Summary of Significant Accounting Policies - Property and Equipment, Estimated Useful Lives (Details) | 9 Months Ended
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Jan. 31, 2022
Minimum [Member] | Furniture, Fixtures and Equipment [Member] |
Property, Plant and Equipment, Useful Life (Year) | 3 years
Minimum [Member] | Leasehold Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 5 years
Minimum [Member] | Building and Building Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 18 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member] |
Property, Plant and Equipment, Useful Life (Year) | 7 years
Maximum [Member] | Leasehold Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 15 years
Maximum [Member] | Building and Building Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 39 years

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- 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
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |