CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance, shares at May. 31, 2021		23,725
Balance, amount at May. 31, 2021	$ 11,449	$ 237	$ 87,553	$ (28)	$ (76,313)
Issuance of common stock under employee plans, shares		1,492
Issuance of common stock under employee plans, amount	2,770	$ 15	2,755	0	0
Proceeds from public offerings, net of issuance costs, shares		1,697
Proceeds from public offerings, net of issuance costs, amount	24,030	$ 17	24,013	0	0
Stock-based compensation	2,186	0	2,186	0	0
Net income	3,656	0	0	0	3,656
Foreign currency translation adjustment	(103)	$ 0	0	(103)	0
Balance, shares at Feb. 28, 2022		26,914
Balance, amount at Feb. 28, 2022	43,988	$ 269	116,507	(131)	(72,657)
Balance, shares at Nov. 30, 2021		26,835
Balance, amount at Nov. 30, 2021	40,862	$ 268	115,602	(108)	(74,900)
Issuance of common stock under employee plans, shares		79
Issuance of common stock under employee plans, amount	26	$ 1	25	0	0
Stock-based compensation	880	0	880	0	0
Net income	2,243	0	0	0	2,243
Foreign currency translation adjustment	(23)	$ 0	0	(23)	0
Balance, shares at Feb. 28, 2022		26,914
Balance, amount at Feb. 28, 2022	43,988	$ 269	116,507	(131)	(72,657)
Balance, shares at May. 31, 2022		27,120
Balance, amount at May. 31, 2022	50,989	$ 271	117,686	(105)	(66,863)
Issuance of common stock under employee plans, shares		1,156
Issuance of common stock under employee plans, amount	1,965	$ 11	1,954	0	0
Proceeds from public offerings, net of issuance costs, shares		209
Proceeds from public offerings, net of issuance costs, amount	6,853	$ 2	6,851	0	0
Stock-based compensation	2,118	0	2,118	0	0
Net income	8,446	0	0	0	8,446
Foreign currency translation adjustment	(35)	$ 0	0	(35)	0
Shares repurchased for tax withholdings on vesting of restricted stock units, shares		(165)
Shares repurchased for tax withholdings on vesting of restricted stock units, amount	(1,680)	$ (1)	(1,679)	0	0
Net unrealized loss on investments	(22)	$ 0	0	(22)	0
Balance, shares at Feb. 28, 2023		28,320
Balance, amount at Feb. 28, 2023	68,634	$ 283	126,930	(162)	(58,417)
Balance, shares at Nov. 30, 2022		27,732
Balance, amount at Nov. 30, 2022	56,667	$ 277	119,094	(155)	(62,549)
Issuance of common stock under employee plans, shares		395
Issuance of common stock under employee plans, amount	853	$ 4	849	0	0
Proceeds from public offerings, net of issuance costs, shares		209
Proceeds from public offerings, net of issuance costs, amount	6,853	$ 2	6,851	0	0
Stock-based compensation	600	0	600	0	0
Net income	4,132	0	0	0	4,132
Foreign currency translation adjustment	9	$ 0	0	9	0
Shares repurchased for tax withholdings on vesting of restricted stock units, shares		(16)
Shares repurchased for tax withholdings on vesting of restricted stock units, amount	(464)	$ 0	(464)	0	0
Net unrealized loss on investments	(16)	$ 0	0	(16)	0
Balance, shares at Feb. 28, 2023		28,320
Balance, amount at Feb. 28, 2023	$ 68,634	$ 283	$ 126,930	$ (162)	$ (58,417)