UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Operating activities:
Net loss	$ (319)	$ (172)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Stock-based compensation	206	280
Depreciation and amortization expense	528	317
Net gain on disposal of equipment	0	(4)
Operating lease right-of use assets	269	245
Provision for doubtful accounts	0	78
Changes in operating assets and liabilities:
Accounts receivable	158	(825)
Prepaid expenses and other current assets	186	93
Other long term assets	0	(70)
Accounts payable	(331)	1,372
Accrued liabilities	(456)	(250)
Other current liabilities	0	15
Other non-current liabilities	0	62
Operating lease liabilities	(250)	(150)
Deferred revenue	(186)	(775)
Net cash (used in) provided by operating activities	(195)	216
Investing activities:
Purchase of property and equipment	(754)	(907)
Net cash used in investing activities	(754)	(907)
Financing activities:
Proceeds from exercise of options	0	2
Net cash provided by financing activities	0	2
Decrease in cash	(949)	(689)
Cash at beginning of period	9,007	4,687
Cash at end of period	$ 8,058	$ 3,998