UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Operating activities:
Net (loss) income	$ (641)	$ 482
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Stock-based compensation	131	75
Issuance of common stock for services	0	8
Depreciation and amortization expense	182	118
Operating lease right-of use assets	98	0
Provision for doubtful accounts	6	0
Deferred rent	0	151
Changes in operating assets and liabilities:
Accounts receivable	480	148
Prepaid expenses and other current assets	52	41
Accounts payable	(82)	(43)
Accrued liabilities	(410)	(203)
Operating lease liabilities	(42)	0
Deferred revenue	(53)	(441)
Net cash (used in) provided by operating activities	(279)	336
Investing activities:
Purchase of property and equipment	(749)	(211)
Net cash used in investing activities	(749)	(211)
Financing activities:
Proceeds from exercise of options and warrants	0	42
Finance lease payments	(7)	(7)
Net cash (used in) provided by financing activities	(7)	35
Increase/(decrease) in cash	(1,035)	160
Cash at beginning of period	3,237	1,006
Cash at end of period	2,202	1,166
Non-cash investing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	3,205	0
Purchase equipment under finance lease	$ 0	$ 249