Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Common Stock [Member] Class A [Member]	Common Stock [Member] Class B [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance at Jul. 31, 2014	$ 26,851	$ 17,087	$ 17,124,339	$ 21,916,575	$ (182,735)	$ (1,223,899)	$ 4,113,613
Balance (in shares) at Jul. 31, 2014	2,685,151	1,708,574				105,354
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	$ 0	0	3,395,643	0	$ 0	804,441
Foreign currency translation adjustment	0	0	0	0	(1,539,568)	0	(612,402)
Cash dividends declared	0	0	0	(2,065,735)	0	0	0
Unrealized investment gains (loss), net	0	0	0	0	(4,036)	0	0
Conversion of Class B common stock to Class A common stock	$ 3,381	$ (3,381)	0	0	0	$ 0	0
Conversion of Class B common stock to Class A common stock (in shares)	338,055	(338,055)				0
Share-based compensation expense	$ 0	$ 0	59,189	0	0	$ 0	0
Tax impact of share based compensation	0	0	(91,849)	0	0	0	0
Tax impact of noncontrolling interests	0	0	(428,299)	0	0	0	0
Distributions to noncontrolling interests	0	0	0	0	0	0	(536,731)
Purchase of additional noncontrolling interests	0	0	(88,094)	0	0	0	(199,531)
Stock award plan forfeitures	$ 0	$ 0	0	0	0	$ 0	0
Stock award plan forfeitures (in shares)	0	0				1,692
Balance at Jul. 31, 2015	$ 30,232	$ 13,706	16,575,286	23,246,483	(1,726,339)	$ (1,223,899)	3,569,390	$ 40,484,859
Balance (in shares) at Jul. 31, 2015	3,023,206	1,370,519				107,046
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	$ 0	0	357,374	0	$ 0	(247,763)	109,611
Foreign currency translation adjustment	0	0	0	0	(381,177)	0	(79,695)	(460,872)
Cash dividends declared	0	0	0	(1,033,753)	0	0	0	(1,033,753)
Unrealized investment gains (loss), net	0	0	0	0	13,867	0	0	13,867
Conversion of Class B common stock to Class A common stock	$ 126	$ (126)	0	0	0	0	0
Conversion of Class B common stock to Class A common stock (in shares)	12,572	(12,572)
Issuance of stock under stock award plan	$ 0	$ 0	(6,361)	0	0	$ 51,828	0
Issuance of stock under stock award plan (in shares)	0	0				(4,533)
Share-based compensation expense	$ 0	$ 0	53,413	0	0	$ 0	0
Distributions to noncontrolling interests	0	0	0	0	0	0	(427,221)
Sale of majority-owned subsidiary	0	0	0	0	0	0	(310,464)
Stock award plan forfeitures				0	0	$ 0	0	0
Stock award plan forfeitures (in shares)						1,278
Balance at Apr. 30, 2016	$ 30,358	$ 13,580	$ 16,622,338	$ 22,570,104	$ (2,093,649)	$ (1,172,071)	$ 2,504,247	$ 38,474,907
Balance (in shares) at Apr. 30, 2016	3,035,778	1,357,947				103,791