Consolidated Statements of Stockholders Equity Statement - USD ($) $ in Thousands	Total	Common & Class B Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Total, Beginning of Period at Jul. 31, 2016	$ 115,551	$ 1,050	$ 34,294	$ 149,945	$ (55,716)	$ (14,022)	$ 0
Common & Class B Stock, Beginning of Period (in shares) at Jul. 31, 2016		10,497,978
Treasury Stock, Beginning of Period (in shares) at Jul. 31, 2016					(3,237,694)
Net Income	10,792	$ 0	0	10,792	$ 0	0	0
Other Comprehensive Income	3,730	0	0	0	0	3,730	0
Dividends Declared	(6,002)	0	0	(6,002)	0	0	0
Purchases of Treasury Stock	(135)	0	0	0	$ (135)	0	0
Purchases of Treasury Stock (in shares)					(3,917)
Net Issuance of Stock Under Long-Term Incentive Plans	170	$ 3	17	0	$ 150	0	0
Net Issuance of Stock Under Long-Term Incentive Plans (in shares)		30,700			9,500
Share-based Compensation	424	$ 0	424	0	$ 0	0	0
Amortization of Restricted Stock	1,507	0	1,507	0	0	0	0
Total, End of Period at Jul. 31, 2017	126,037	$ 1,053	36,242	154,735	$ (55,701)	(10,292)	0
Common & Class B Stock, End of Period (in shares) at Jul. 31, 2017		10,528,678
Treasury Stock, End of Period (in shares) at Jul. 31, 2017					(3,232,111)
Net Income	8,222	$ 0	0	8,240	$ 0	0	(18)
Other Comprehensive Income	1,941	0	0	0	0	1,941	0
Reclassification upon adoption of accounting standard	0	0	0	2,264	0	(2,264)	0
Dividends Declared	(6,304)	0	0	(6,304)	0	0	0
Purchases of Treasury Stock	(27)	0	0	0	$ (27)	0	0
Purchases of Treasury Stock (in shares)					(622)
Net Issuance of Stock Under Long-Term Incentive Plans	241	$ 3	456	0	$ (218)	0	0
Net Issuance of Stock Under Long-Term Incentive Plans (in shares)		27,150			(6,100)
Amortization of Restricted Stock	1,775	$ 0	1,775	0	$ 0	0	0
Total, End of Period at Jul. 31, 2018	$ 131,885	$ 1,056	$ 38,473	$ 158,935	$ (55,946)	$ (10,615)	$ (18)
Common & Class B Stock, End of Period (in shares) at Jul. 31, 2018		10,555,828
Treasury Stock, End of Period (in shares) at Jul. 31, 2018					(3,238,833)