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Note 4 - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($)
Apr. 30, 2016
Apr. 30, 2015
Exchange Traded Funds [Member]    
Available-for-sale Securities, Amortized Cost Basis $ 3,445,000 $ 3,903,000
Gross Unrealized Gains 194,000 1,508,000
Gross Unrealized Losses (2,000)
Available-for-sale Securities 3,637,000 5,411,000
Common Stock [Member]    
Available-for-sale Securities, Amortized Cost Basis   101,000
Gross Unrealized Gains   74,000
Gross Unrealized Losses  
Available-for-sale Securities   175,000
Inverse Exchange Traded Funds [Member]    
Available-for-sale Securities, Amortized Cost Basis   5,466,000
Gross Unrealized Gains  
Gross Unrealized Losses   (1,420,000)
Available-for-sale Securities   4,046,000
Available-for-sale Securities, Amortized Cost Basis 3,445,000 9,470,000
Gross Unrealized Gains   1,582,000
Gross Unrealized Losses   (1,420,000)
Available-for-sale Securities $ 3,637,000 $ 9,632,000