LEASES - Operating and finance ROU assets and lease liabilities (Details)	Jul. 31, 2019 USD ($)
LEASES
Operating Right-of-use assets, net	$ 2,214,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Operating Right-of-use assets, net
Finance Lease, Right-of-Use Asset	$ 82,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net
Total leased assets	$ 2,296,000
Operating Lease, Liability, Current	$ 378,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	is-gaap:OperatingLeaseLiabilityCurrent
Finance Lease, Liability, Current	$ 73,000
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Finance Lease, Liability, Current
Operating Lease, Liability, Noncurrent	$ 2,042,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating Lease, Liability, Noncurrent
Finance Lease, Liability, Noncurrent	$ 9,000
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Finance Lease, Liability, Noncurrent
Total lease liabilities	$ 2,502,000