LEASES - Operating and finance ROU assets and lease liabilities (Details)	Jan. 31, 2020 USD ($)
LEASES
Operating right-of-use assets	$ 2,075,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Operating right-of-use assets
Finance Lease, Right-of-Use Asset	$ 45,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net
Total leased assets	$ 2,120,000
Operating Lease, Liability, Current	$ 395,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	is-gaap:OperatingLeaseLiabilityCurrent
Finance Lease, Liability, Current	$ 45,000
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Finance Lease, Liability, Current
Operating Lease, Liability, Noncurrent	$ 1,945,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating Lease, Liability, Noncurrent
Total lease liabilities	$ 2,385,000