Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jul. 31, 2017

Description of Business and Summary of Significant Accounting Policies [Abstract]

Schedule of exercise of stock options and warrants which were excluded from the diluted per share

	Years Ended
	July 31,
	2017		2016		2015
	(in thousands)
Stock options		29		3		4
Warrants		65		—		—
Non-vested restricted Class B common stock		251		196		331
Shares excluded from the calculations of diluted loss per share		345		199		335

Summary of shares excluded from the diluted earnings per share computations

	Years Ended
	July 31,
	2017		2016		2015
	(in thousands)
Warrants		7		—		—
Stock options		—		88		—
Non-vested restricted Class B common stock		—		—		—
Shares excluded from the calculations of diluted loss per share		7		88		—

Schedule of change in the allowance for doubtful accounts

Year ended July 31, (in thousands)	Balance at beginning of year		Additions charged to costs and expenses		Deductions		Balance at end of year
2017
Reserves deducted from accounts receivable:
Allowance for doubtful accounts	$	—	$	19	$	—	$	19
2016
Reserves deducted from accounts receivable:
Allowance for doubtful accounts	$	—	$	—	$	—	$	—