UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Operating activities:
Net income (loss)	$ (172)	$ 75
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation	280	120
Depreciation and amortization expense	317	277
Net gain on disposal of equipment	(4)	0
Gain on termination of operating lease	0	(75)
Operating lease right-of use assets	245	(67)
Provision for (reversal of) doubtful accounts	78	(6)
Changes in operating assets and liabilities:
Accounts receivable	(825)	(263)
Prepaid expenses and other current assets	93	25
Other long term assets	(70)	0
Accounts payable	1,372	(465)
Accrued liabilities	(250)	(348)
Other current liabilities	15	0
Other non-current liabilities	62	1
Operating lease liabilities	(150)	157
Deferred revenue	(775)	(146)
Net cash provided by (used in) operating activities	216	(715)
Investing activities:
Purchase of property and equipment	(907)	(718)
Refund of security deposit	0	92
Net cash used in investing activities	(907)	(626)
Financing activities:
Proceeds from exercise of options	2	0
Finance lease payments	0	(58)
Net cash provided by (used in) financing activities	2	(58)
Decrease in cash	(689)	(1,399)
Cash at beginning of period	4,687	8,342
Cash at end of period	3,998	6,943
Non-cash investing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	0	3,872
Equipment acquired in accounts payable	$ 79	$ 0