Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Income Statement [Abstract]
Revenues	$ 13,575	$ 8,949	$ 25,984	$ 17,153
Cost of revenues	9,245	8,599	16,786	16,808
Gross margin	4,330	350	9,198	345
Selling and administrative expenses	2,552	2,034	4,853	4,026
Research and development expenses	840	599	1,347	1,709
Operating income (loss)	938	(2,283)	2,998	(5,390)
Other income (expense):
Investment (expense) income	(106)	(12)	(86)	24
Interest expense	(29)	(18)	(60)	(63)
Income (loss) before provision for income taxes	803	(2,313)	2,852	(5,429)
Provision for income taxes	6	1	13	2
Net income (loss)	$ 797	$ (2,314)	$ 2,839	$ (5,431)
Net income (loss) per common share:
Basic and diluted income (loss) per share (in Dollars per share)	$ 0.08	$ (0.25)	$ 0.3	$ (0.58)
Weighted average shares outstanding:
Basic and diluted (in Shares)	9,399,000	9,326,000	9,392,000	9,317,000
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 797	$ (2,314)	$ 2,839	$ (5,431)
Unrealized loss on marketable securities:
Change in market value of marketable securities before reclassification, net of tax	0	(581)	0	(552)
Reclassification adjustment for realized gains included in net income (loss), net of tax	0	16	0	1
Total unrealized loss on marketable securities, net of tax	0	(565)	0	(551)
Comprehensive income (loss)	$ 797	$ (2,879)	$ 2,839	$ (5,982)