Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Jan. 31, 2022	Jul. 31, 2021
Net of allowance (in Dollars)	$ 0	$ 0
Preferred stock par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,400	2,400
Preferred stock, shares issued
Treasury stock, shares	74	58
Class A Common Stock
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	2,600	2,600
Common stock, shares issued	525	525
Common stock, shares outstanding	525	525
Class B Common Stock
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	40,000	40,000
Common stock, shares issued	13,949	13,923
Common stock, shares outstanding	13,875	13,865