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Note I - Capital Stock (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 | $ 0.01
Preferred Stock, Shares Issued, Total (in shares) | 0 | 0
Preferred Stock, Shares Authorized (in shares) | 1,000,000 | 1,000,000
Subsidiaries [Member] |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 1 |
Preferred Stock, Shares Issued, Total (in shares) | 500,000 |
Preferred Stock, Dividend Rate, Percentage | 8.00% |
Preferred Stock Right of Shareholder, Amount of Shares (in shares) | 400,000 |
Preferred Stock, Right to Shareholder Value of Redeemed Stock | $ 400,000 |

X
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X
- Definition The redemption (or callable) amount of redeemable preferred stock, excluding currently redeemable preferred stock. Excludes amounts representing dividends not declared or paid. + References No definition available. + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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