LEASES - Operating and finance ROU assets and lease liabilities (Details)	Apr. 30, 2020 USD ($)
LEASES
Operating lease right-of-use assets	$ 2,008,000
Finance Lease, Right-of-Use Asset	$ 27,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net
Total leased assets	$ 2,035,000
Operating Lease, Liability, Current	395,000
Finance Lease, Liability, Current	27,000
Operating Lease, Liability, Noncurrent	1,879,000
Total lease liabilities	$ 2,301,000