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Consolidated Balance Sheets (Parentheticals) - USD ($)
shares in Thousands, $ in Thousands
Jul. 31, 2020
Jul. 31, 2019
Trade accounts receivable (in Dollars) $ 6,085 $ 5,444
Preferred stock par value (in Dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued
Class A common stock    
Common stock, par value (in Dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 35,000 35,000
Common stock, shares issued 3,272 3,272
Common stock, shares outstanding 1,574 1,574
Treasury stock, common stock shares 1,698 1,698
Class B common stock    
Common stock, par value (in Dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 200,000 200,000
Common stock, shares issued 25,961 25,803
Common stock, shares outstanding 24,345 24,895
Treasury stock, common stock shares 1,616 908