CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited)
Net sales	$ 14,815	$ 9,611	$ 25,486	$ 15,257
Cost of sales	6,904	5,092	13,094	8,457
Gross profit	7,911	4,519	12,392	6,800
Operating expenses:
Selling, general and administrative	2,875	2,489	5,400	4,442
Research and development	1,551	1,313	3,049	2,634
Total operating expenses	4,426	3,802	8,449	7,076
Income (loss) from operations	3,485	717	3,943	(276)
Interest income (expense), net	263	(1)	384	(10)
Gain from forgiveness of PPP loan	0	0	0	1,698
Other (expense) income, net	(5)	35	19	58
Income before income tax expense	3,743	751	4,346	1,470
Income tax expense	(18)	(34)	(32)	(57)
Net income	$ 3,725	$ 717	$ 4,314	$ 1,413
Net income per share
Basic	$ 0.14	$ 0.03	$ 0.16	$ 0.06
Diluted	$ 0.13	$ 0.03	$ 0.15	$ 0.05
Shares used in per share calculations:
Basic	27,579	26,205	27,410	25,102
Diluted	29,080	28,342	28,934	26,849