Consolidated Statements of Changes in Shareholders' Equity Unaudited (USD $)	3 Months Ended	6 Months Ended		12 Months Ended
	Jan. 31, 2013	Jan. 31, 2013	Jan. 31, 2012	Jul. 31, 2012
Balance		$ 52,757,541
Net income	1,931,142	2,474,238	2,708,342
Foreign currency translation adjustment	195,755	312,747	(275,368)
Cash dividends paid	(1,018,540)	(1,018,540)	(1,017,776)	(2,000,000)
Unrealized investment gain, net	(2,700)	37,916	19,612
Balance	53,197,643	53,197,643		52,757,541
Common Stock [Member] | Class A [Member]
Balance		26,851	26,851	26,851
Balance (in shares)		2,685,151	2,685,151	2,685,151
Net income		0		0
Foreign currency translation adjustment		0		0
Cash dividends paid		0		0
Unrealized investment gain, net		0		0
Repurchase of Class A common stock				0
Repurchase of Class A common stock (in shares)				0
Issuance of stock under stock award plan				0
Issuance of stock under stock award plan (in shares)				0
Share-based compensation expense		0		0
Tax impact of share based compensation				0
Sale of subsidiary shares to noncontrolling interests				0
Distributions to noncontrolling interests		0		0
Purchase of additional noncontrolling interests		0		0
Purchase of additional noncontrolling interests (in shares)		0		0
Stock award plan forfeitures		0		0
Stock award plan forfeitures (in shares)		0		0
Balance	26,851	26,851		26,851
Balance (in shares)	2,685,151	2,685,151		2,685,151
Common Stock [Member] | Class B [Member]
Balance		17,087	17,087	17,087
Balance (in shares)		1,708,574	1,708,574	1,708,574
Net income		0		0
Foreign currency translation adjustment		0		0
Cash dividends paid		0		0
Unrealized investment gain, net		0		0
Repurchase of Class A common stock				0
Repurchase of Class A common stock (in shares)				0
Issuance of stock under stock award plan				0
Issuance of stock under stock award plan (in shares)				0
Share-based compensation expense		0		0
Tax impact of share based compensation				0
Sale of subsidiary shares to noncontrolling interests				0
Distributions to noncontrolling interests		0		0
Purchase of additional noncontrolling interests		0		0
Purchase of additional noncontrolling interests (in shares)		0		0
Stock award plan forfeitures		0		0
Stock award plan forfeitures (in shares)		0		0
Balance	17,087	17,087		17,087
Balance (in shares)	1,708,574	1,708,574		1,708,574
Capital in Excess of Par Value [Member]
Balance		19,751,992	19,983,029	19,983,029
Net income		0		0
Foreign currency translation adjustment		0		0
Cash dividends paid		0		0
Unrealized investment gain, net		0		0
Repurchase of Class A common stock				0
Issuance of stock under stock award plan				(716,662)
Share-based compensation expense		255,985		731,583
Tax impact of share based compensation				105,988
Sale of subsidiary shares to noncontrolling interests				0
Distributions to noncontrolling interests		0		0
Purchase of additional noncontrolling interests		(163,732)		(351,946)
Stock award plan forfeitures		0		0
Balance	19,844,245	19,844,245		19,751,992
Retained earnings [Member]
Balance		29,534,783	30,797,763	30,797,763
Net income		2,153,613		773,579
Foreign currency translation adjustment		0		0
Cash dividends paid		(1,018,540)		(2,036,559)
Unrealized investment gain, net		0		0
Repurchase of Class A common stock				0
Issuance of stock under stock award plan				0
Share-based compensation expense		0		0
Tax impact of share based compensation				0
Sale of subsidiary shares to noncontrolling interests				0
Distributions to noncontrolling interests		0		0
Purchase of additional noncontrolling interests		0		0
Stock award plan forfeitures		0		0
Balance	30,669,856	30,669,856		29,534,783
Accumulated Other Comprehensive Income (loss) [Member]
Balance		711,842	1,527,189	1,527,189
Net income		0		0
Foreign currency translation adjustment		312,405		(871,476)
Cash dividends paid		0		0
Unrealized investment gain, net		18,658		17,597
Repurchase of Class A common stock				0
Issuance of stock under stock award plan				0
Share-based compensation expense		0		0
Tax impact of share based compensation				0
Sale of subsidiary shares to noncontrolling interests				0
Distributions to noncontrolling interests		0		0
Purchase of additional noncontrolling interests		0		38,532
Stock award plan forfeitures		0		0
Balance	1,042,905	1,042,905		711,842
Treasury Stock [Member]
Balance		(1,897,032)	(2,317,515)	(2,317,515)
Balance (in shares)		149,531	190,724	190,724
Net income		0		0
Foreign currency translation adjustment		0		0
Cash dividends paid		0		0
Unrealized investment gain, net		0		0
Repurchase of Class A common stock				(363,050)
Repurchase of Class A common stock (in shares)				22,825
Issuance of stock under stock award plan				716,662
Issuance of stock under stock award plan (in shares)				(62,099)
Share-based compensation expense		0		0
Tax impact of share based compensation				0
Sale of subsidiary shares to noncontrolling interests				0
Distributions to noncontrolling interests		0		0
Purchase of additional noncontrolling interests		98,799		66,871
Purchase of additional noncontrolling interests (in shares)		(7,804)		(5,208)
Stock award plan forfeitures		0		0
Stock award plan forfeitures (in shares)		798		3,289
Balance	(1,798,233)	(1,798,233)		(1,897,032)
Balance (in shares)	142,525	142,525		149,531
Noncontrolling Interest [Member]
Balance		4,612,018	3,923,429	3,923,429
Net income		320,625		2,266,171
Foreign currency translation adjustment		342		124,455
Cash dividends paid		0		0
Unrealized investment gain, net		19,258		0
Repurchase of Class A common stock				0
Issuance of stock under stock award plan				0
Share-based compensation expense		0		0
Tax impact of share based compensation				0
Sale of subsidiary shares to noncontrolling interests				41,634
Distributions to noncontrolling interests		(808,429)		(1,123,896)
Purchase of additional noncontrolling interests		(748,882)		(619,775)
Stock award plan forfeitures		0		0
Balance	$ 3,394,932	$ 3,394,932		$ 4,612,018