Consolidated Statements of Income - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Revenues:
Revenues	$ 36,257,000	$ 35,868,000	$ 34,574,000
Gain on sale of operating facility			8,123,000
Total revenues	36,257,000	35,868,000	42,697,000
Expenses:
Advertising and promotion	3,406,000	3,780,000	3,473,000
Salaries and employee benefits	17,781,000	18,488,000	17,477,000
Production and distribution	5,222,000	5,857,000	9,063,000
Office and administration	4,435,000	5,171,000	5,225,000
Total expenses	30,844,000	33,296,000	35,238,000
Income from operations	5,413,000	2,572,000	7,459,000
Revenues interest in EAM Trust	8,260,000	8,040,000	7,195,000
Profits interest in EAM Trust	1,049,000	746,000	519,000
Income from securities transactions, net	504,000	540,000	312,000
Income before income taxes	15,226,000	11,898,000	15,485,000
Income tax provision	4,076,000	(2,840,000)	5,118,000
Net income	$ 11,150,000	$ 14,738,000	$ 10,367,000
Earnings per share, basic & fully diluted (in dollars per share)	$ 1.15	$ 1.52	$ 1.07
Weighted average number of common shares (in shares)	9,683,771	9,703,255	9,721,958
Subscription and Circulation [Member]
Revenues:
Revenues	$ 28,820,000	$ 29,503,000	$ 30,168,000
License [Member]
Revenues:
Revenues	$ 7,437,000	$ 6,365,000	$ 4,406,000