CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited)
Net sales	$ 10,671	$ 5,646
Cost of sales	6,190	3,365
Gross profit	4,481	2,281
Operating expenses:
Selling, general and administrative	2,525	1,953
Research and development	1,498	1,321
Total operating expenses	4,023	3,274
Income (loss) from operations	458	(993)
Interest income (expense), net	121	(9)
Gain from forgiveness of PPP loan	0	1,698
Other income, net	24	23
Income before income tax expense	603	719
Income tax expense	(14)	(23)
Net income	$ 589	$ 696
Net income per share:
Basic	$ 0.02	$ 0.03
Diluted	$ 0.02	$ 0.03
Shares used in per share calculations:
Basic	27,242	23,999
Diluted	28,788	25,356