CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Operating activities:
Net income (loss)	$ 362	$ (2,093)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Stock-based compensation expense	598	600
Depreciation and amortization expense	1,184	825
Gain on disposal of equipment	0	(52)
Operating lease right-of-use assets	398	403
Goodwill Impairment	0	335
Gain on termination of operating lease	(75)	0
Allowance for doubtful accounts	49	277
Changes in operating assets and liabilities:
Accounts receivable	(2,265)	(670)
Prepaid expenses and other current assets	(572)	(77)
Accounts payable	(1,246)	333
Accrued liabilities	(316)	1,440
Operating lease liabilities	(242)	(235)
Other non-current liability	3	27
Deferred revenue	441	1,792
Net cash (used in) provided by operating activities	(1,681)	2,905
Investing activities:
Purchase of property and equipment	(3,281)	(2,220)
Refund of security deposit	112	0
Net cash used in investing activities	(3,169)	(2,220)
Financing activities:
Proceeds from exercise of options and warrants	1,369	4,455
Finance lease payments	(174)	(35)
Net cash provided by financing activities	1,195	4,420
Increase (decrease) in cash	(3,655)	5,105
Cash, beginning of year	8,342	3,237
Cash, end of year	4,687	8,342
Non-cash investing and financing activities:
Purchased equipment under finance lease	0	212
Right-of-use assets obtained in exchange for operating lease liabilities	6,121	3,201
Credit received on purchase of equipment	$ 0	$ 160