CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated other comprehensive loss	Retained Earnings (Accumulated Deficit)	Noncontrolling Interest	Aher Test Systems Share holders Equity
Balance, shares at May. 31, 2020		23,107
Balance, amount at May. 31, 2020	$ 14,056,000	$ 231,000	$ 85,898,000	$ 2,234,000	$ (74,286,000)	$ (21,000)	$ 14,077,000
Shares repurchased for tax withholdings on vesting of RSUs, share		(9)
Shares repurchased for tax withholdings on vesting of RSUs, amount	(20,000)	$ 0	(20,000)	0	0	0	(20,000)
Issuance of common stock under employee plans, share		627
Issuance of common stock under employee plans, amount	580,000	$ 6,000	574,000	0	0	0	580,000
Stock-based compensation	1,101,000	0	1,101,000	0	0	0	1,101,000
Net Income (Loss)	(2,027,000)	0	0	0	(2,027,000)	0	(2,027,000)
Reclassification of cumulative translation adjustment	(2,401,000)	0	0	(2,401,000)	0	0	(2,401,000)
Foreign currency translation adjustment	160,000	$ 0	0	139,000	0	21,000	139,000
Balance, shares at May. 31, 2021		23,725
Balance, amount at May. 31, 2021	11,449,000	$ 237,000	87,553,000	(28,000)	(76,313,000)	0	11,449,000
Shares repurchased for tax withholdings on vesting of RSUs, share		(62)
Shares repurchased for tax withholdings on vesting of RSUs, amount	(429,000)	$ 0	(429,000)	0	0	0	(429,000)
Issuance of common stock under employee plans, share		1,760
Issuance of common stock under employee plans, amount	3,560,000	$ 17,000	3,543,000	0	0	0	3,560,000
Stock-based compensation	3,006,000	0	3,006,000	0	0	0	3,006,000
Net Income (Loss)	9,450,000	0	0	0	9,450,000	0	9,450,000
Foreign currency translation adjustment	(77,000)	$ 0	0	(77,000)	0	0	(77,000)
Proceeds from public offerings, net of issuance costs, share		1,697
Proceeds from public offerings, net of issuance costs, amount	24,030,000	$ 17,000	24,013,000	0	0	0	24,030,000
Balance, shares at May. 31, 2022		27,120
Balance, amount at May. 31, 2022	50,989,000	$ 271,000	117,686,000	(105,000)	(66,863,000)	0	50,989,000
Shares repurchased for tax withholdings on vesting of RSUs, share		(178)
Shares repurchased for tax withholdings on vesting of RSUs, amount	(2,060,000)	$ (1,000)	(2,059,000)	0	0	0	(2,060,000)
Issuance of common stock under employee plans, share		1,388
Issuance of common stock under employee plans, amount	2,562,000	$ 13,000	2,549,000	0	0	0	2,562,000
Stock-based compensation	2,782,000	0	2,782,000	0	0	0	2,782,000
Net Income (Loss)	14,557,000	0	0	0	14,557,000	0	14,557,000
Foreign currency translation adjustment	(33,000)	$ 0	0	(33,000)	0	0	(33,000)
Proceeds from public offerings, net of issuance costs, share		209
Proceeds from public offerings, net of issuance costs, amount	6,820,000	$ 2,000	6,818,000	0	0	0	6,820,000
Net unrealized loss on investments	(17,000)	$ 0	0	(17,000)	0	0	(17,000)
Balance, shares at May. 31, 2023		28,539
Balance, amount at May. 31, 2023	$ 75,600,000	$ 285,000	$ 127,776,000	$ (155,000)	$ (52,306,000)	$ 0	$ 75,600,000