INCOME TAXES Components of Deferred Tax Assets and Liabilities (Details) - USD ($)	Jul. 31, 2020	Jul. 31, 2019
Deferred Tax Asset
Depreciation	$ 0	$ 0
Deferred compensation	1,779,000	2,121,000
Postretirement benefits	3,293,000	6,100,000
Lease right of use assets	0	0
Lease liabilities	2,918,000	0
Allowance for doubtful accounts	178,000	81,000
Deferred marketing expenses	0	0
Other assets	0	390,000
Accrued expenses	4,131,000	2,076,000
Tax credits	147,000	250,000
Amortization	48,000	166,000
Inventories	343,000	264,000
Depletion	0	0
Stock-based compensation	987,000	556,000
Reclamation	447,000	392,000
Other assets - foreign	790,000	585,000
Valuation allowance	(923,000)	(732,000)
Total deferred tax assets	14,138,000	12,249,000
Deferred Tax Liability
Depreciation	3,926,000	3,995,000
Deferred compensation	0	0
Postretirement benefits	0	0
Lease right of use assets	2,534,000	0
Lease liabilities	0	0
Allowance for doubtful accounts	0	0
Deferred marketing expenses	194,000	326,000
Other liabilities	9,000	0
Accrued expenses	0	0
Tax credits	0	0
Amortization	0	0
Inventories	0	0
Depletion	173,000	173,000
Stock-based compensation	0	0
Reclamation	0	0
Other assets - foreign	0	0
Valuation allowance	0	0
Total deferred tax liabilities	$ 6,836,000	$ 4,494,000