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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Level 3 (Tables)
12 Months Ended
Jul. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
Short-Term Investments
The table below shows the composition of short-term investments as of July 31, 2018 (in thousands):
 
 
2018
U.S. Treasury securities
 
$
3,992

Certificates of deposit
 
3,132

Short-term investments
 
$
7,124

Inventories
The composition of inventories was as follows as of July 31 (in thousands):
 
 
2019
 
2018
Finished goods
 
$
13,957

 
$
14,223

Packaging
 
5,681

 
5,349

Other
 
4,525

 
2,949

Inventories
 
$
24,163

 
$
22,521

Estimated Intangible Amortization Expense
Our estimated intangible amortization expense for the next five fiscal years is as follows (in thousands):
2020
$
667

2021
$
484

2022
$
334

2023
$
201

2024
$
68

Acquired Finite-Lived Intangible Assets Weighted Average Amortization Period
The weighted average amortization period of our intangibles subject to amortization is as follows (in years):
 
Weighted Average Amortization Period
Trademarks and patents
15.2
Debt issuance costs
1.1
Customer list
4.3
Total intangible assets subject to amortization
6.5
Property, Plant and Equipment Estimated Useful Lives
 
Years
Buildings and leasehold improvements
3
-
40
Machinery and equipment
 
 
 
Packaging
2
-
20
Processing
2
-
25
Mining and other
3
-
20
Office furniture and equipment
2
-
15
Vehicles
2
-
15