UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Operating activities:
Net income	$ 105	$ 76
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	414	205
Depreciation and amortization expense	663	584
Net gain on disposal of equipment	(4)	0
Gain on termination of operating lease	0	(75)
Operating lease right-of use assets	519	79
Provision for doubtful accounts	117	49
Changes in operating assets and liabilities:
Accounts receivable	(1,321)	(1,237)
Prepaid expenses and other current assets	226	(92)
Accounts payable	1,506	568
Accrued liabilities	(320)	(507)
Other current liabilities	15	0
Other non-current liabilities	54	3
Operating lease liabilities	(406)	138
Deferred revenue	(124)	373
Net cash provided by operating activities	1,444	164
Investing activities:
Purchase of property and equipment	(1,473)	(1,224)
Refund of security deposit	0	92
Net cash used in investing activities	(1,473)	(1,132)
Financing activities:
Proceeds from exercise of options	123	1,294
Finance lease payments	0	(115)
Net cash provided by financing activities	123	1,179
Increase in cash	94	211
Cash at beginning of period	4,687	8,342
Cash at end of period	4,781	8,553
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
Unpaid portion of property and equipment purchase	$ 0	$ 240