Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Class A Common Stock	Class B Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Treasury Stock	Total
Balance at Jul. 31, 2018	$ 5	$ 98	$ 22,508	$ (702)	$ (11,899)		$ 10,010
Balance, shares at Jul. 31, 2018	525	9,786
Stock-based compensation			121				121
Stock-based compensation, shares
Purchase of treasury stock						(31)	(31)
Foreign currency translation adjustment				(131)			(131)
Net income (loss)					(706)		(706)
Balance at Oct. 31, 2018	$ 5	$ 98	22,629	(833)	(12,605)	(31)	9,263
Balance, shares at Oct. 31, 2018	525	9,786
Balance at Jul. 31, 2018	$ 5	$ 98	22,508	(702)	(11,899)		10,010
Balance, shares at Jul. 31, 2018	525	9,786
Proceeds from sales of Class B Common Stock
Net income (loss)							(946)
Balance at Jan. 31, 2019	$ 5	$ 98	22,839	(833)	(12,845)	(31)	9,233
Balance, shares at Jan. 31, 2019	525	9,824
Balance at Oct. 31, 2018	$ 5	$ 98	22,629	(833)	(12,605)	(31)	9,263
Balance, shares at Oct. 31, 2018	525	9,786
Stock-based compensation			162				162
Stock-based compensation, shares		16
Stock issued for matching contributions to the 401(k) Plan			48				48
Stock issued for matching contributions to the 401(k) Plan, shares		19
Net income (loss)					(240)		(240)
Balance at Jan. 31, 2019	$ 5	$ 98	22,839	(833)	(12,845)	(31)	9,233
Balance, shares at Jan. 31, 2019	525	9,824
Balance at Jul. 31, 2019	$ 5	$ 99	23,131	(985)	(15,243)	(47)	6,960
Balance, shares at Jul. 31, 2019	525	9,876
Stock-based compensation			98				98
Stock-based compensation, shares
Purchase of treasury stock						(22)	(22)
Foreign currency translation adjustment				(143)			(143)
Net income (loss)					(801)		(801)
Balance at Oct. 31, 2019	$ 5	$ 99	23,229	(1,128)	(16,044)	(69)	6,092
Balance, shares at Oct. 31, 2019	525	9,876
Balance at Jul. 31, 2019	$ 5	$ 99	23,131	(985)	(15,243)	(47)	6,960
Balance, shares at Jul. 31, 2019	525	9,876
Proceeds from sales of Class B Common Stock							275
Net income (loss)							(701)
Balance at Jan. 31, 2020	$ 5	$ 100	23,705	(1,136)	(15,944)	(76)	6,654
Balance, shares at Jan. 31, 2020	525	9,980
Balance at Oct. 31, 2019	$ 5	$ 99	23,229	(1,128)	(16,044)	(69)	6,092
Balance, shares at Oct. 31, 2019	525	9,876
Exercise of stock options			4				4
Exercise of stock options, shares		30
Stock-based compensation		$ 1	156				157
Stock-based compensation, shares		48
Purchase of treasury stock						(7)	(7)
Stock issued for matching contributions to the 401(k) Plan			41				41
Stock issued for matching contributions to the 401(k) Plan, shares		26
Proceeds from sales of Class B Common Stock			275				275
Foreign currency translation adjustment				(8)			(8)
Net income (loss)					100		100
Balance at Jan. 31, 2020	$ 5	$ 100	$ 23,705	$ (1,136)	$ (15,944)	$ (76)	$ 6,654
Balance, shares at Jan. 31, 2020	525	9,980