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RIGHT-OF-USE ASSETS AND LEASE LIABILITIES (Details) - Lessee, Operating Lease, Liability, Maturity - USD ($) $ in Thousands	Jul. 31, 2020	Apr. 30, 2020
Lessee, Operating Lease, Liability, Maturity [Abstract]
Remainder of 2021	$ 1,312
2022	1,886
2023	1,815
2024	1,834
2025	1,723
Thereafter	5,492
Total lease payments	14,062
Less imputed interest	(3,068)
Present value of future lease payments	10,994	$ 11,313
Less current obligations under leases	(1,822)	(1,869)
Long-term lease obligations	$ 9,172	$ 9,444

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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