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Note 2 - Investments (Details Textual) - USD ($)
 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Apr. 30, 2016
Available-for-sale Securities, Amortized Cost Basis $ 8,385,000   $ 3,445,000
Available-for-sale Securities, Equity Securities 8,816,000   3,637,000
Proceeds from Sale of Available-for-sale Securities, Equity 14,000 $ 8,789,000  
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent 232,000 (237,000)  
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 431,000   192,000
AOCI Tax, Attributable to Parent 152,000   67,000
AOCI Tax, Attributable to Parent 152,000   67,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax $ 431,000   192,000
Available-for-sale Securities, Debt Securities, Average Yield 0.69%    
Equity Method Investments $ 58,197,000   57,942,000
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement 90.00%    
Accrued Non Voting Revenues and Non Voting Profits Interests Payable $ 1,921,000    
Available-for-sale Securities, Debt Securities 6,129,000   0
EAM Trust [Member]      
Equity Method Investments 58,197,000 [1]   57,942,000
Fair Value of Contributed Capital at Inception 55,805,000   55,805,000
Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to CapitalAccount $ 5,820,000   5,820,000
Percentage of Non Voting Profit Interest 50.00%    
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement 90.00%    
Accrued Non Voting Revenues and Non Voting Profits Interests Payable $ 1,921,000   $ 1,750,000
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 6,000    
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 6,000    
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
AOCI Tax, Attributable to Parent 2,000    
AOCI Tax, Attributable to Parent 2,000    
Equity Securities [Member]      
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent 238,000 (237,000)  
Deferred Taxes on Unrealized Gains on Securities $ 84,000 84,000  
Loss From Sale of Equity Securities Reclassified into Consolidated Condensed Statement of Income [Member]      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax   $ (15,000)  
[1] Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.