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Note I - Capital Stock (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020
Common Stock, Shares Authorized (in shares) | 50,000,000 | 50,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 | $ 0.01
Preferred Stock, Shares Authorized (in shares) | 1,000,000 | 1,000,000
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
Subsidiaries [Member] |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 1.00 |
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 |

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- 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 Face amount or stated value per share of common stock. + 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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- Definition The maximum number of common shares 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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