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Investments
 12 Months Ended
Apr. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Investments
Investments
Investments consist of the following (in thousands): 
 
April 30,
 
2020
 
2019
Trading:
 
 
 
Debt securities—Tax-exempt state and municipal bonds
$
3,104

 
$
16,192

Marketable equity securities
11,758

 
11,002

 
$
14,862

 
$
27,194


The total carrying value of all investments on a consolidated basis was approximately $14.9 million and $27.2 million at April 30, 2020 and 2019, respectively. At April 30, 2020, there were approximately $0.7 million in trading investments included in investments-noncurrent in the accompanying consolidated balance sheet. At April 30, 2019, there were approximately $2.5 million in trading investments included in investments-noncurrent in the accompanying consolidated balance sheet.
The contractual maturities of debt securities classified as trading at April 30, 2020 and 2019 were as follows (in thousands): 
 
2020
 
2019
Due within one year
$
2,403

 
$
13,708

Due within two years
701

 
2,484

Due within three years
—

 
—

Due after three years
—

 
—

 
$
3,104

 
$
16,192


In fiscal 2020, 2019 and 2018, the Company’s investment portfolio of marketable equity securities experienced unrealized holding gains of $0.7 million, unrealized holding losses of approximately $0.9 million and unrealized holding losses of approximately $1.0 million, respectively. In fiscal 2020, 2019 and 2018, the Company’s investment portfolio of debt securities experienced unrealized holding losses of approximately $0.6 million, unrealized holding losses of $0.1 million and unrealized holding gains of approximately $0.1 million, respectively. In fiscal 2020, 2019 and 2018, the Company’s investment portfolio of marketable equity securities experienced realized holding losses of approximately $0.2 million, realized holding losses of $0.1 million and realized holding losses of approximately $0 million, respectively. In fiscal 2020, 2019 and 2018, the Company’s investment portfolio of debt securities experienced realized holding gains of approximately $0.7 million for all periods. Unrealized and realized gains and losses are included in "Other income, net" in the company’s condensed consolidated statements of operations.