CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Operating activities:
Net loss	$ (7,276,000)	$ (5,335,000)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Stock-based compensation expense	1,118,000	864,000
Depreciation and amortization expense	1,867,000	2,246,000
Net loss on disposal of equipment	435,000	0
Operating lease right-of-use assets	1,066,000	952,000
Asset impairment	0	807,000
Allowance for doubtful accounts and estimated credit losses	476,000	195,000
Changes in operating assets and liabilities:
Accounts receivable	(1,991,000)	1,308,000
Prepaid expenses and other current assets	(167,000)	(184,000)
Other long term assets	(169,000)	0
Accounts payable	465,000	2,465,000
Accrued liabilities	(109,000)	(145,000)
Operating lease liabilities	(1,169,000)	(907,000)
Deferred revenue	(683,000)	1,706,000
Net cash (used in) provided by operating activities	(6,137,000)	3,972,000
Investing activities:
Purchase of property and equipment	(836,000)	(2,872,000)
Net cash used in investing activities	(836,000)	(2,872,000)
Financing activities:
Proceeds from exercise of options	253,000	85,000
Repurchases of common stock	(634,000)	(74,000)
Finance lease payments	(146,000)	0
Net cash (used in) provided by financing activities	(527,000)	11,000
(Decrease) increase in cash	(7,500,000)	1,111,000
Cash, beginning of year	10,118,000	9,007,000
Cash, end of year	2,618,000	10,118,000
Non-cash financing and investing activities:
Purchased equipment under finance lease	0	368,000
Right-of-use assets obtained in exchange for operating lease liabilities	$ 0	$ 231,000