UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Operating activities:
Net income	$ 892	$ 1,035
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	724	437
Depreciation and amortization expense	1,059	881
Net gain on disposal of equipment	(4)	0
Gain on termination of operating lease	0	(75)
Operating lease right-of use assets	535	226
Provision for doubtful accounts	117	49
Changes in operating assets and liabilities:
Accounts receivable	(1,693)	(1,401)
Prepaid expenses and other current assets	397	(34)
Accounts payable	1,772	(1,395)
Accrued liabilities	(205)	(122)
Other current liabilities	15	0
Other non-current liabilities	50	3
Operating lease liabilities	(403)	(106)
Deferred revenue	2,445	801
Net cash provided by operating activities	5,701	299
Investing activities:
Purchase of property and equipment	(1,878)	(2,427)
Refund of security deposit	0	92
Net cash used in investing activities	(1,878)	(2,335)
Financing activities:
Proceeds from exercise of options	191	1,296
Finance lease payments	0	(173)
Net cash provided by financing activities	191	1,123
Increase (decrease) in cash	4,014	(913)
Cash at beginning of period	4,687	8,342
Cash at end of period	8,701	7,429
Non-cash investing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	205	3,872
Equipment acquired in accounts payable	$ 79	$ 0