Equity (Details) - USD ($)		9 Months Ended
	May 01, 2017	Apr. 30, 2017	Jul. 31, 2016
Equity (Textual)
Treasury stock, shares		40,000	40,000
Treasury stock, value		$ 428,000	$ 428,000
Common stock issued for exercises of stock options		$ 8,000
Warrants outstanding		104,479
Warrants [Member]
Equity (Textual)
Common stock issued for exercises of warrants, shares		147,682
Class B Common Stock [Member]
Equity (Textual)
Issuances of warrants to purchase		252,161
Class B Common Stock [Member] | Stock options [Member]
Equity (Textual)
Common stock issued for exercises of stock options, Shares		1,440
Common stock issued for exercises of stock options		$ 8,000
Class B Common Stock [Member] | Warrants [Member]
Equity (Textual)
Common stock issued for exercises of warrants, shares		147,682
Common stock issued for exercises of stock options, value		$ 5,125,000
Class B Common Stock [Member] | Warrants [Member] | Subsequent Event [Member]
Equity (Textual)
Common stock issued for exercises of stock options, Shares	1,865
Common stock issued for exercises of stock options	$ 11,000
Class B Common Stock [Member] | Other officers [Member]
Equity (Textual)
Stock issued during period as compensation		108,000
Class B Common Stock [Member] | Other employees [Member]
Equity (Textual)
Stock issued during period as compensation		56,000
Class B Common Stock [Member] | Jonas [Member]
Equity (Textual)
Stock issued during period as compensation		180,000
Class B Common Stock [Member] | Consultant [Member]
Equity (Textual)
Stock issued during period as compensation		1,250
Class B Common Stock [Member] | Director [Member]
Equity (Textual)
Stock issued during period as compensation		24,000