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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Aug. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
The following table sets forth by level, within the fair value hierarchy, certain assets at estimated fair value as of August 31, 2018 and 2017:
 
 
 
Quoted Prices in

Active Markets for

Identical Assets

(Level 1)
 
 
Significant Other

Observable

Inputs

(Level 2)
 
 
Significant

Unobservable

Inputs

(Level 3)
 
 
Total
 
August 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities
 
$
2,846,000
 
 
$
—
 
 
$
—
 
 
$    
2,846,000
 
Liability for short sales of trading securities
 
 
(933,000
)
 
 
—
 
 
 
—
 
 
 
(933,000
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
August 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities
 
$
1,596,000
 
 
 
—
 
 
 
—
 
 
$
1,596,000
 
Liability for short sales of trading securities
 
 
(707,000
)
 
 
—
 
 
 
—
 
 
 
(707,000
)