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Note 4 - Investments (Details Textual) - USD ($)
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
EAM Trust [Member]      
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  
Equity Method Investments [1] $ 57,942,000 58,048,000  
Percentage of Non Voting Profit Interest 50.00%    
Accrued Non Voting Revenues and Non Voting Profits Interests Payable $ 1,750,000 1,951,000  
Equity Securities [Member]      
Proceeds from Sale of Available-for-sale Securities, Equity 10,206,000    
Available-for-sale Securities, Gross Realized Gains 224,000    
Deferred Taxes on Unrealized Gains on Securities 9,000 76,000  
Available-for-sale Securities, Amortized Cost Basis 3,445,000 9,470,000  
Available-for-sale Securities $ 3,637,000 9,632,000  
Percentage of Annual Dividend Return on Investment 3.00%    
Proceeds from Sale of Available-for-sale Securities, Equity $ 10,206,000 57,000
Available-for-sale Securities, Gross Realized Gains [2] 224,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent 29,000 (217,000) (8,000)
Capital Gain Distribution from Available for Sale Securities [3] 105,000 57,000 $ 36,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 192,000 162,000  
AOCI Tax, Attributable to Parent 68,000 57,000  
Equity Method Investments $ 57,942,000 $ 58,048,000  
[1] Reported within Long Term Assets on Consolidated Balance Sheets.
[2] Capital gains of $224,000 were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income in fiscal 2016.
[3] Capital gain distributions of $105,000 and $57,000 were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income in fiscal 2016 and 2015, respectively.