CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited)
Net sales	$ 17,206	$ 15,283	$ 42,692	$ 30,540
Cost of sales	8,331	8,886	21,425	17,343
Gross profit	8,875	6,397	21,267	13,197
Operating expenses:
Selling, general and administrative	3,250	2,612	8,650	7,054
Research and development	1,832	1,529	4,881	4,163
Total operating expenses	5,082	4,141	13,531	11,217
Income from operations	3,793	2,256	7,736	1,980
Interest income (expense), net	374	1	758	(9)
Gain from forgiveness of PPP loan	0	0	0	1,698
Other (expense) income, net	(18)	10	1	68
Income before income tax expense	4,149	2,267	8,495	3,737
Income tax expense	(17)	(24)	(49)	(81)
Net income	$ 4,132	$ 2,243	$ 8,446	$ 3,656
Earnings per share
Basic	$ 0.15	$ 0.08	$ 0.31	$ 0.14
Diluted	$ 0.14	$ 0.08	$ 0.29	$ 0.13
Shares used in per share calculations:
Basic	27,893	26,871	27,571	25,684
Diluted	29,373	28,854	29,080	27,510