19. SELECTED QUARTERLY CONSOLIDATED FINANCIAL DATA (Tables)

12 Months Ended

May 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Selected quarterly consolidated financial data (unaudited)

    The following tables (presented in thousands, except per share data) sets forth selected unaudited condensed consolidated statements of operations data for each of the four quarters of the fiscal years ended May 31, 2020 and 2019.

	Three Months Ended
	Aug. 31,			Nov. 30,		Feb. 29,		May 31,
	2019			2019		2020		2020
Net sales	$	5,533		$	6,874	$	6,111	$	3,773
Gross profit (loss)	$	2,271		$	3,202	$	2,991	$	(93	)
Net (loss) income	$	(413	)	$	251	$	245	$	(2,885	)
Net (loss) income per share basic and diluted	$	(0.02	)	$	0.01	$	0.01	$	(0.13	)

	Three Months Ended
	Aug. 31,			Nov. 30,			Feb. 28,			May 31,
	2018			2018			2019			2019
Net sales	$	4,740		$	5,911		$	3,163		$	7,242
Gross profit	$	1,553		$	2,398		$	272		$	3,379
Net (loss) income	$	(1,515	)	$	(629	)	$	(3,201	)	$	110
Net (loss) income per share basic and diluted	$	(0.07	)	$	(0.03	)	$	(0.14	)	$	0.00