CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Operating activities:
Net income	$ 548	$ 362
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock-based compensation expense	912	598
Depreciation and amortization expense	1,627	1,184
Net gain on disposal of equipment	(4)	0
Operating lease right-of-use assets	786	398
Gain on termination of operating lease	0	(75)
Allowance for doubtful accounts	292	49
Changes in operating assets and liabilities:
Accounts receivable	(2,818)	(2,265)
Prepaid expenses and other current assets	(187)	(572)
Accounts payable	974	(1,246)
Accrued liabilities	183	(316)
Operating lease liabilities	(631)	(242)
Other non-current liability	0	3
Deferred revenue	4,815	441
Net cash provided by (used in) operating activities	6,497	(1,681)
Investing activities:
Purchase of property and equipment	(2,384)	(3,281)
Refund of security deposit	0	112
Net cash used in investing activities	(2,384)	(3,169)
Financing activities:
Proceeds from exercise of options and warrants	207	1,369
Finance lease payments	0	(174)
Net cash provided by financing activities	207	1,195
Increase (decrease) in cash	4,320	(3,655)
Cash, beginning of year	4,687	8,342
Cash, end of year	9,007	4,687
Non-cash financing and investing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	$ 205	$ 6,121