Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Cash flows from operating activities:
Net income	$ 13,283,000	$ 9,283,000
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	815,000	3,728,000
Non-voting revenues interest in EAM Trust	(6,074,000)	(5,389,000)
Non-voting profits interest in EAM Trust	(583,000)	(393,000)
Realized gain on sale of operating facility		(8,123,000)
Realized gains on sale of equity securities	(152,000)
Deferred rent	444,000	(167,000)
Deferred income taxes	(6,405,000)	(1,257,000)
Other, net	(45,000)	(45,000)
Changes in operating assets and liabilities:
Unearned revenue	(1,547,000)	(1,203,000)
Accounts payable & accrued expenses	13,000	(748,000)
Accrued salaries	95,000	(13,000)
Accrued taxes on income	(211,000)	65,000
Prepaid and refundable income taxes	(486,000)	61,000
Prepaid expenses and other current assets	406,000	(272,000)
Accounts receivable	(1,785,000)	(768,000)
Total adjustments	(15,515,000)	(14,524,000)
Net cash used in operating activities	(2,232,000)	(5,241,000)
Cash flows from investing activities:
Purchases of equity securities classified as available-for-sale		(4,954,000)
Purchases of fixed income securities classified as available-for-sale	(2,636,000)	(6,135,000)
Proceeds from sales of equity securities classified as available-for-sale	152,000	14,000
Proceeds from sales of fixed income securities classified as available-for-sale	1,634,000
Distributions received from EAM Trust	6,575,000	5,572,000
Proceeds from sale of operating facility		11,555,000
Restricted money market investment		(469,000)
Acquisition of property and equipment	(398,000)	(879,000)
Expenditures for capitalized software		(411,000)
Net cash provided by investing activities	5,327,000	4,293,000
Cash flows from financing activities:
Purchase of treasury stock at cost	(191,000)	(681,000)
Dividends paid	(5,243,000)	(4,965,000)
Net cash used in financing activities	(5,434,000)	(5,646,000)
Net change in cash and cash equivalents	(2,339,000)	(6,594,000)
Cash and cash equivalents at beginning of year	6,557,000	13,122,000
Cash and cash equivalents at end of period	$ 4,218,000	$ 6,528,000