UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Operating activities:
Net income	$ 816	$ 72
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	437	437
Depreciation and amortization expense	881	579
Gain on disposal of equipment	0	(52)
Gain on termination of operating lease	(75)	0
Operating lease right-of use assets	226	299
Provision for doubtful accounts	49	218
Changes in operating assets and liabilities:
Accounts receivable	(1,401)	(334)
Prepaid expenses and other current assets	(34)	(47)
Accounts payable	(1,395)	(913)
Accrued liabilities	97	(202)
Other non-current liabilities	3	0
Operating lease liabilities	(106)	(261)
Deferred revenue	801	564
Net cash provided by operating activities	299	360
Investing activities:
Purchase of property and equipment	(2,427)	(693)
Refund of security deposit	92	0
Net cash used in investing activities	(2,335)	(693)
Financing activities:
Proceeds from exercise of options and warrants	1,296	429
Finance lease payments	(173)	(51)
Net cash provided by financing activities	1,123	378
Increase (decrease) in cash	(913)	45
Cash at beginning of period	8,342	3,237
Cash at end of period	7,429	3,282
Non-cash investing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	3,872	3,205
Unpaid portion of property and equipment purchase	0	321
Credit received on purchase of equipment	$ 0	$ 160