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Note I - Capital Stock (Details Textual) - USD ($)
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Subsidiaries [Member]    
Preferred Stock, Shares Issued 500,000  
Preferred Stock, Par or Stated Value Per Share $ 1  
Preferred Stock, Dividend Rate, Percentage 8.00%  
Preferred Stock Right of Shareholder, Amount of Shares 400,000  
Preferred Stock, Right to Shareholder Value of Redeemed Stock $ 400,000  
Preferred Stock, Shares Issued 0 0
Preferred Stock, Shares Authorized 1,000,000 1,000,000
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01