UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Operating activities:
Net income (loss)	$ 76	$ (334)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation	205	208
Depreciation and amortization expense	584	360
Gain on disposal of equipment	0	(52)
Gain on termination of operating lease	(75)	0
Operating lease right-of use assets	79	198
Provision for doubtful accounts	49	34
Changes in operating assets and liabilities:
Accounts receivable	(1,237)	425
Prepaid expenses and other current assets	(92)	(55)
Accounts payable	568	(341)
Accrued liabilities	(507)	(339)
Other non-current liabilities	3	0
Operating lease liabilities	138	(147)
Deferred revenue	373	124
Net cash provided by operating activities	164	81
Investing activities:
Purchase of property and equipment	(1,224)	(522)
Refund of security deposit	92	0
Net cash used in investing activities	(1,132)	(522)
Financing activities:
Proceeds from exercise of options and warrants	1,294	2
Finance lease payments	(115)	(14)
Net cash provided by (used in) financing activities	1,179	(12)
Increase (decrease) in cash	211	(453)
Cash at beginning of period	8,342	3,237
Cash at end of period	8,553	2,784
Non-cash investing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	3,872	3,205
Unpaid portion of property and equipment purchase	240	321
Credit received on purchase of equipment	$ 0	$ 160