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Investments (Tables)
 12 Months Ended
Apr. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Components of Investments
Investments consist of the following (in thousands): 
 
April 30,
 
2019
 
2018
Trading:
 
 
 
Debt securities—Tax-exempt state and municipal bonds
$
16,192

 
$
23,889

Marketable equity securities
11,002

 
11,125

 
$
27,194

 
$
35,014
Contractual Maturities of Debt Securities Classified as Trading
The contractual maturities of debt securities classified as trading at April 30, 2019 and 2018 were as follows (in thousands): 
 
2019
 
2018
Due within one year
$
13,708

 
$
14,996

Due within two years
2,484

 
8,893

Due within three years
—

 
—

Due after three years
—

 
—

 
$
16,192

 
$
23,889