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Note 4 - Supplementary Cash Flow Information - Supplementary Cash Flow Elements (Details) - USD ($)	6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Apr. 30, 2018	Apr. 30, 2017
Cash and cash equivalents	$ 4,585,000	$ 4,360,000	$ 5,941,000
Restricted cash	469,000	469,000
Total cash, cash equivalents, and restricted cash shown in the Consolidated Condensed Statement of Cash Flows	5,054,000	4,829,000	$ 6,410,000	$ 7,026,000
State and local income tax payments	119,000	166,000
Federal income tax payments to the Parent	$ 1,300,000	$ 2,200,000

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

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Amount represents Federal income tax payments to the Parent.

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