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Note 4 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($)
Apr. 30, 2017
Apr. 30, 2016
Available-for-sale Equity Securities, Amortized Cost Basis $ 8,385,000 $ 3,445,000
Available-for-sale Securities, Equity Securities 9,097,000 3,637,000
Amortized Cost 4,384,000  
Gross Unrealized Gains 4,000  
Gross Unrealized Losses (3,000)  
Fair Value 4,385,000  
Amortized Cost 3,100,000  
Gross Unrealized Gains  
Gross Unrealized Losses (6,000)  
Fair Value 3,094,000  
Amortized Cost 7,484,000  
Gross Unrealized Gains 4,000  
Gross Unrealized Losses (9,000)  
Available-for-sale Securities, Debt Securities 7,479,000 0
Exchange Traded Funds [Member]    
Available-for-sale Equity Securities, Amortized Cost Basis 8,385,000 3,445,000
Gross Unrealized Gains 712,000 194,000
Gross Unrealized Losses (2,000)
Available-for-sale Securities, Equity Securities $ 9,097,000 $ 3,637,000