Consolidated Statements of Income - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Revenues:
Revenues	$ 35,868,000	$ 34,574,000	$ 34,546,000
Gain on sale of operating facility		8,123,000
Total revenues	35,868,000	42,697,000	34,546,000
Expenses:
Advertising and promotion	3,780,000	3,473,000	3,685,000
Salaries and employee benefits	18,488,000	17,477,000	15,702,000
Production and distribution	5,857,000	9,063,000	8,725,000
Office and administration	5,171,000	5,225,000	4,554,000
Total expenses	33,296,000	35,238,000	32,666,000
Income from operations	2,572,000	7,459,000	1,880,000
Revenues interest in EAM Trust	8,040,000	7,195,000	7,211,000
Profits interest in EAM Trust	746,000	519,000	440,000
Income from securities transactions, net	540,000	312,000	477,000
Income before income taxes	11,898,000	15,485,000	10,008,000
Income tax provision	(2,840,000)	5,118,000	2,717,000
Net income	$ 14,738,000	$ 10,367,000	$ 7,291,000
Earnings per share, basic & fully diluted (in dollars per share)	$ 1.52	$ 1.07	$ 0.75
Weighted average number of common shares (in shares)	9,703,255	9,721,958	9,781,495
Subscription and Circulation [Member]
Revenues:
Revenues	$ 29,503,000	$ 30,168,000	$ 31,925,000
License [Member]
Revenues:
Revenues	$ 6,365,000	$ 4,406,000	$ 2,621,000